Thu, 07 Aug 2008 21:55:43 BST CiteULike: dcastro's broadband http://www.citeulike.org/user/dcastro/tag/broadband CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/3041397 <i>Antennas and Propagation Society International Symposium, 1988. AP-S. Digest (1988), pp. 936-939 vol.3.</i><br /><br />The authors discuss the design of a wideband, dual-proportion, <e1>C</e1>-band patch radiator with a 20% bandwidth for input voltage-standing-wave ratio <2. The aperture-coupled patch antenna, is selected as the starting point of the design. The authors focus on two of the advantages of aperture-coupled patch antennas: the aperture-coupling feed scheme eliminates the soldering process required to secure a pin connecting the feed circuit to the patch, as is necessary in fabricating the conventional probe-fed patch antenna; this can greatly reduce the complexity in constructing large patch arrays consisting of hundreds or thousands of elements; and the ground plane sandwiched between the feed circuitry and the radiating patch can prevent the radiation from the feed network from interfering with the patch radiation pattern. A description is given of the approaches used to achieve the bandwidth and the polarization requirements Aperture-coupled patch antennas with wide-bandwidth and dual-polarization capabilities CH Tsao YM Hwang F Kilburg F Dietrich doi:10.1109/APS.1988.94241 Antennas and Propagation Society International Symposium, 1988. AP-S. Digest (1988), pp. 936-939 vol.3. 2008-07-24T23:35:18-00:00 1988 Antennas and Propagation Society International Symposium, 1988. AP-S. Digest 936 939 vol.3 antenna broadband dual patch polarisation http://www.citeulike.org/user/dcastro/article/3041396 <i>Electronics Letters, Vol. 35, No. 2. (1999), pp. 98-100.</i><br /><br />A novel stacked shorted patch antenna is presented. The new printed antenna has significantly improved impedance behaviour compared to previously considered shorted patches, with a 10 dB return loss bandwidth of greater than 30%. The antenna is relatively easy to manufacture and can be accommodated on a mobile communication handset terminal Broadband stacked shorted patch RB Waterhouse doi:10.1049/el:19990086 Electronics Letters, Vol. 35, No. 2. (1999), pp. 98-100. 2008-07-24T23:34:42-00:00 1999 Electronics Letters 35 2 98 100 broadband patch shorted stacked http://www.citeulike.org/user/dcastro/article/3020911 <i>Antennas and Wireless Propagation Letters, IEEE, Vol. 2 (2003), pp. 36-39.</i><br /><br />A microstrip antenna formed by two stacked patches is proposed for dual-frequency and broad-band performance. Different E-plane and H-plane arrangements are studied to achieve an isolation between bands better than 30 dB. A prototype operating at the 1.8 GHz and 3.5 GHz bands has been simulated and tested. Dual-frequency broad-band stacked microstrip patch antenna J Anguera C Puente C Borja N Delbene J Soler doi:10.1109/LAWP.2003.811325 Antennas and Wireless Propagation Letters, IEEE, Vol. 2 (2003), pp. 36-39. 2008-07-19T14:08:26-00:00 2003 Antennas and Wireless Propagation Letters, IEEE 2 36 39 antenna broadband dual-band microstrip patch stacked http://www.citeulike.org/user/dcastro/article/3015400 <i>Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings, Vol. 3 (2005), 4 pp..</i><br /><br />This paper presents a broadband high efficiency circularly polarized active antenna integrated with class-E power amplifier (PA) at 2GHz. A single circular microstrip patch fed by a cross slot is employed as not only a broadband circularly polarized radiator but also as a harmonics-termination load network, which is directly connected with the class-E power amplifier output. A low cost PCB technology is employed in the circuit fabrication and a low voltage PHEMT transistor is used. A peak drain efficiency of 71.1% for the class-E amplifier is measured at 2.05GHz, together with a maximum radiated power of 28.2 dBm from the active integrated antenna (AIA). Power added efficiency (PAE) over 50% within a 17% bandwidth from 1.92GHz to 2.28GHz is achieved. Axial ratio below 3 dB is obtained over a 9% bandwidth from 1.99 GHz to 2.18 GHz. Broadband high efficiency circularly polarized active integrated antenna Y Qin S Gao M Elsdon A Sambell doi:10.1109/APMC.2005.1606698 Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings, Vol. 3 (2005), 4 pp.. 2008-07-17T19:46:36-00:00 2005 Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings 3 4 pp. active antenna broadband circular polarisation http://www.citeulike.org/user/dcastro/article/2176491 <i>Communications Magazine, IEEE, Vol. 42, No. 9. (2004), pp. 80-89.</i><br /><br />In recent years, there has been an upsurge of interest in multihop-augmented infrastructure-based networks in both the industry and academia, such as the seed concept in 3GPP, mesh networks in IEEE 802.16, and converge extension of HiperLAN/2 through relays or user-cooperative diversity mesh networks. This article, a synopsis of numerous contributions to the working group 4 of the wireless world research forum and other research work, presents an overview of important topics and applications in the context of relaying. It covers different approaches to exploiting the benefits of multihop communications via relays, such as solutions for radio range extension in mobile and wireless broadband cellular networks (trading range for capacity), and solutions to combat shadowing at high radio frequencies. Furthermore, relaying is presented as a means to reduce infrastructure deployment costs. It is also shown that through the exploitation of spatial diversity, multihop relaying can enhance capacity in cellular networks. We wish to emphasize that while this article focuses on fixed relays, many of the concepts presented can also be applied to systems with moving relays. Relay-based deployment concepts for wireless and mobile broadband radio Relay-based deployment concepts for wireless and mobile broadband radio R Pabst R Pabst BH Walke BH Walke DC Schultz DC Schultz P Herhold H Yanikomeroglu S Mukherjee H Viswanathan M Lott W Zirwas M Dohler A10 H Aghvami A11 DD Falconer A12 GP Fettweis A13 doi:10.1109/MCOM.2004.1336724 Communications Magazine, IEEE, Vol. 42, No. 9. (2004), pp. 80-89. 2007-12-28T05:38:41-00:00 2004 Communications Magazine, IEEE 42 9 80 89 broadband mobile radio http://www.citeulike.org/user/dcastro/article/2994230 <i>Communications Magazine, IEEE, Vol. 38, No. 6. (2000), pp. 128-133.</i><br /><br />The demand for advanced information services is growing in terms of both the number of users and the services to be supported. Voice and low-rate data services are insufficient for users in a world where high-speed World Wide Web access is taken for granted. The trend is toward global information networks offering flexible multimedia information services to users on demand, anywhere, anytime. Potential services include video on demand, interactive video, fast Internet access, telemedicine, tele-education, and large file transfer. The need to support bandwidth-intensive multimedia services places new and challenging demands on satellite systems and networks. Flexibility, efficiency, mobility, and the ability to guarantee end-to-end quality of service are at a premium A survey of future broadband multimedia satellite systems, issues and trends J Farserotu R Prasad doi:10.1109/35.846084 Communications Magazine, IEEE, Vol. 38, No. 6. (2000), pp. 128-133. 2008-07-11T23:01:18-00:00 2000 Communications Magazine, IEEE 38 6 128 133 broadband satellite http://www.citeulike.org/user/dcastro/article/2958635 <i>Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th, Vol. 6 (2004), pp. 3997-4001 Vol. 6.</i><br /><br />The paper proposes and evaluates a forward link multiple access scheme for a next generation broadband and scalable mobile satellite communication system that offers transmission capacity of 1 Gbps and the maximum bit rate of 100 Mbps. Two major evaluation items are considered. (1) Capacity comparison is made among frequency reuse schemes: single frequency (SF); multiple frequency (MF); variable boundary multiple frequency (VMF). (2) Bit error rates are evaluated among four multiplexing schemes (FDM, OFDM, OCDM and TDM) in terms of required E/sub b//N/sub 0/ through nonlinear and frequency selective Rician fading channels. Evaluation results show that the proposed multiple access scheme, which combines VMF reuse with FDM or OFDM multiplexing, is the optimal solution. Forward link multiple access scheme for broadband and scalable mobile satellite communication system K Kobayashi K Ohata M Ueba Y Sagawa doi:10.1109/VETECF.2004.1404828 Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th, Vol. 6 (2004), pp. 3997-4001 Vol. 6. 2008-07-03T10:23:42-00:00 2004 Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th 6 3997 4001 Vol. 6 broadband communication mobile satellite http://www.citeulike.org/user/dcastro/article/2941950 <i>Journal of Zhejiang University - Science A, Vol. 6, No. 6. (13 June 2005), pp. 483-486.</i><br /><br />Abstract  A tunable dual-broad-band branch-line coupler (BLC) utilizing composite right/left-handed (CRLH) transmission lines is presented. Two λ/4 segments consisting of CRLH transmission lines are added to each port to broaden the dual bands of the branch-line coupler. Numerical simulation and optimal design of the novel coupler are presented. The dual bands of the novel coupler are tunable and broad. The 1-dB bandwidth of each passband is more than, 16% of the central frequency. A tunable dual-broad-band branch-line coupler utilizing composite right/left-handed transmission lines Zhang Yu Hu Li He Sai-Ling doi:10.1007/BF02841752 Journal of Zhejiang University - Science A, Vol. 6, No. 6. (13 June 2005), pp. 483-486. 2008-06-29T18:25:45-00:00 2005 Journal of Zhejiang University - Science A 6 6 483 486 broadband coupler crlh dual-band tl http://www.citeulike.org/user/dcastro/article/2941949 <i>Journal of Zhejiang University - Science A, Vol. 7, No. 1. (23 January 2006), pp. 5-23.</i><br /><br />Abstract  In this paper, we summarize some recent activities in the field of metamaterial research at the National University of Singapore (NUS). Integral equations are applied for electromagnetic modelling of supernatural materials. Some special characteristics of the metamaterials are shown. Moreover, quasi-static Lorentz theory and numerical method (i.e., the method of moments for solving the electric field integral equation) and the transmission line theory are both presented to obtain the effective constitutive relations of metamaterials, respectively. Finally, feasibility of fabricating metamaterials based on analysis of equivalent transmission line model in the microwave spectrum and even higher is also shown and correspondingly some broad-bandwidth and low-loss metamaterial structures are designed and synthesized. Broad-bandwidth and low-loss metamaterials: Theory, design and realization Le-Wei Li Hai-Ying Yao Qun Wu Zhi-Ning Chen doi:10.1631/jzus.2006.A0005 Journal of Zhejiang University - Science A, Vol. 7, No. 1. (23 January 2006), pp. 5-23. 2008-06-29T18:25:25-00:00 2006 Journal of Zhejiang University - Science A 7 1 5 23 broadband loss low metamaterial http://www.citeulike.org/user/dcastro/article/2924552 <i>Acoustics, Speech, and Signal Processing, 2002. Proceedings. (ICASSP '02). IEEE International Conference on, Vol. 4 (2002), pp. IV-3756-IV-3759 vol.4.</i><br /><br />Broadband wireless services are typically considered usable in limited mobility conditions (fixed access or at pedestrian speeds). In this paper, we present a method for time and frequency synchronization of broadband OFDM for mobile ad hoc networking systems, where each node randomly and rapidly changes location. The proposed method is robust in Rayleigh fading and is computationally tractable for low-power digital signal processor (DSP) implementations. The synchronization method uses a pseudo-noise (PN) preamble sequence, provides low probability of false detection, low probability of missed detection, and exhibits a low peak-to-average power ratio (PAPR). We show that the power spectral density (PSD) of the PN-based preamble, after the digital up-converter shaping filter, fits into a spectral mask similar to that of the OFDM traffic signal's PSD. Efficient implementation is demonstrated using frequency-domain equivalent processing on a fixed-point Texas Instruments DSP and a floating-point Motorola G4 PowerPC with Altivec. Synchronization for broadband OFDM mobile ad hoc networking: simulation and implementation JE Kleider S Gifford doi:10.1109/ICASSP.2002.1004734 Acoustics, Speech, and Signal Processing, 2002. Proceedings. (ICASSP '02). IEEE International Conference on, Vol. 4 (2002), pp. IV-3756-IV-3759 vol.4. 2008-06-24T22:32:13-00:00 2002 Acoustics, Speech, and Signal Processing, 2002. Proceedings. (ICASSP '02). IEEE International Conference on 4 IV-3756 IV-3759 vol.4 ad-hoc broadband mobile ofdm simulation synchronization http://www.citeulike.org/user/dcastro/article/2920520 <i>Microwave and Wireless Components Letters, IEEE, Vol. 18, No. 1. (2008), pp. 25-27.</i><br /><br />A broadband quadrature power splitter (QPS) is developed using the metamaterial transmission line (MM TL). It consists of a Wilkinson power divider and two phase-adjusting TLs, namely a MM TL and a microstrip (MS). The slope of the phase-response curve of the MM TL is synthesized to be the same as that of the MS along with the 90deg phase increment at two design frequencies. Hence, the broadband quadrature phase difference over the desired frequency range can be obtained. In this letter, the QPS is developed at the center frequency of 2 GHz. Over the frequency range of 1.1-3.5 GHz, an amplitude imbalance of less than 0.9 dB and a phase error of less than plusmn5deg have been experimentally demonstrated. A Broadband Quadrature Power Splitter Using Metamaterial Transmission Line Chao-Hsiung Tseng Chih-Lin Chang doi:10.1109/LMWC.2007.911981 Microwave and Wireless Components Letters, IEEE, Vol. 18, No. 1. (2008), pp. 25-27. 2008-06-24T07:20:16-00:00 2008 Microwave and Wireless Components Letters, IEEE 18 1 25 27 broadband circuit divider metamaterial power http://www.citeulike.org/user/dcastro/article/2920482 <i>Microwaves, Antennas & Propagation, IET, Vol. 1, No. 1. (2007), pp. 116-128.</i><br /><br />The solution to the canonical problem of a radiating infinitesimal electric dipole antenna that is centred in a multilayered, concentric metamaterial-based spherical shell system is presented. It is demonstrated that when this system is electrically small, a specifically designed homogenous and isotropic epsilon-negative (ENG) layer can function as a distributed matching element to the antenna enabling a resonant radiation behaviour. A finite element model of the corresponding centre-fed cylindrical dipole antenna-based resonant system confirms that such designed ENG-based spherical layers can act as a distributed matching element, which can be optimised to produce a reactance free, resistively matched and, hence, efficient radiating system. Several limits on the dispersion properties of the homogenous and isotropic ENG media used in these matching layers are considered and their impact on the bandwidth of these resonant systems is established. Although the dispersionless resonant antenna-ENG system has a bandwidth substantially below the Chu limit, the bandwidths of the corresponding dispersive systems are shown to be at or just slightly below the Chu limit. An analytical model of an idealised gaseous plasma-based ENG layer sandwiched between two glass layers, a potential realisation of these metamaterial-based ENG spherical shell systems, is introduced and its solution is used to study these efficiency and bandwidth issues further. Resonant systems based on active ENG metamaterial layers realised with two types of idealised gain medium models are shown to have bandwidths that approach the idealised dispersionless medium values and, consequently, are substantially below the Chu limit At and below the chu limit: passive and active broad bandwidth metamaterial-based electrically small antennas RW Ziolkowski A Erentok doi:10.1049/iet-map:20050342 Microwaves, Antennas & Propagation, IET, Vol. 1, No. 1. (2007), pp. 116-128. 2008-06-24T07:05:27-00:00 2007 Microwaves, Antennas & Propagation, IET 1 1 116 128 active antenna based broadband metamaterial pasive small http://www.citeulike.org/user/dcastro/article/2903003 <i>Broadband Communications, 1998. Accessing, Transmission, Networking. Proceedings. 1998 International Zurich Seminar on (1998), pp. 99-104.</i><br /><br />This paper investigates the system performance of coherent OFDM transmission over frequency selective fading channels taking into account the constraints imposed by the receiver complexity. The effects of synchronization errors in the receiver are analyzed. In a properly designed inner receiver, these errors lead to extra noise. Specifying the limits for this additional noise allows one to derive the requirements for each component and thus to design and optimize the inner receiver independently from the outer receiver. The resulting receiver structure and the synchronization algorithms applied are introduced. Particular attention is paid to the channel estimation unit since its accuracy is most essential for system performance. A short analysis of the complexity of the algorithms allows one to determine the limits of the single components. System simulations including inner and outer receiver are used to evaluate the ideal vs. the realizable performance of the receiver and thus show how it is bounded by receiver complexity Broadband transmission using OFDM: system performance and receiver complexity M Speth S Fechtel G Fock H Meyr doi:10.1109/IZSBC.1998.670251 Broadband Communications, 1998. Accessing, Transmission, Networking. Proceedings. 1998 International Zurich Seminar on (1998), pp. 99-104. 2008-06-17T19:01:32-00:00 1998 Broadband Communications, 1998. Accessing, Transmission, Networking. Proceedings. 1998 International Zurich Seminar on 99 104 broadband ofdm receiver http://www.citeulike.org/user/dcastro/article/2897761 <i>Microwave and Wireless Components Letters, IEEE, Vol. 15, No. 11. (2005), pp. 808-810.</i><br /><br />A metamaterial 1:4 series power divider that provides equal power split to all four output ports over a large bandwidth is presented, which can be extended to an arbitrary number of output ports. The divider comprises four nonradiating metamaterial lines in series, incurring a zero insertion phase over a large bandwidth, while simultaneously maintaining a compact length of /spl lambda//sub 0//8. Compared to a series power divider employing conventional one-wavelength long meandered transmission lines to provide in-phase signals at the output ports, the metamaterial divider provides a 165% increase in the input return-loss bandwidth and a 155% and 154% increase in the through-power bandwidth to ports 3 and 4, respectively. In addition, the metamaterial divider is significantly more compact, occupying only 2.6% of the area that the transmission line divider occupies. The metamaterial and transmission line dividers exhibit comparable insertion losses. A broadband series power divider using zero-degree metamaterial phase-shifting lines MA Antoniades GV Eleftheriades doi:10.1109/LMWC.2005.859007 Microwave and Wireless Components Letters, IEEE, Vol. 15, No. 11. (2005), pp. 808-810. 2008-06-16T07:03:20-00:00 2005 Microwave and Wireless Components Letters, IEEE 15 11 808 810 broadband divider metamaterial power http://www.citeulike.org/user/dcastro/article/926309 <i>Proceedings of the IEEE, Vol. 89, No. 1. (2001), pp. 58-75.</i><br /><br />This paper presents a vision for wireless communication systems beyond the third generation, which comprises a combination of several optimized access systems on a common IP-based medium-access and core network platform. These different access systems will interwork via horizontal and vertical handover, service negotiation, and global roaming. The different access systems are allocated to different cell layers in the sense of hierarchical cells with respect to cell size, coverage, and mobility to provide globally optimized seamless services to all users. This vision requires extensive international research and standardization activities to solve many technical challenges. Key issues are the global interworking of different access systems on a common platform, the implementation of multimode and multiband terminals and base stations by software-defined radio concepts as well as advanced antenna concepts Broadband wireless access and future communication networks R Becher M Dillinger M Haardt W Mohr doi:10.1109/5.904506 Proceedings of the IEEE, Vol. 89, No. 1. (2001), pp. 58-75. 2006-11-03T02:03:22-00:00 2001 Proceedings of the IEEE 89 1 58 75 broadband wireless http://www.citeulike.org/user/dcastro/article/2883705 <i>Communications Magazine, IEEE, Vol. 40, No. 4. (2002), pp. 34-35.</i> Wideband wireless access technologies to broadband internet [Guest Editorial] M Guizani WW Lu P Meche M Sawahashi doi:10.1109/MCOM.2002.995849 Communications Magazine, IEEE, Vol. 40, No. 4. (2002), pp. 34-35. 2008-06-11T20:11:02-00:00 2002 Communications Magazine, IEEE 40 4 34 35 broadband wideband wireless http://www.citeulike.org/user/dcastro/article/2839827 <i>Microwave Symposium, 2007. IEEE/MTT-S International (2007), pp. 1745-1748.</i><br /><br />This paper presents a broadband quadrature hybrid which makes use of the broadband power division properties of conventional Wilkinson power splitters along with broadband phase difference achieved using metamaterial based delay lines. The bandwidth of the 90degplusmn5deg phase difference and 0.48 dB power difference between the outputs of the Wilkinson power splitter and metamaterial delay line combination is 67%. The full four-port coupler is formed employing an additional combiner. A phase/power difference between the hybrid outputs of 90degplusmn10deg and 1.2 dB, respectively, are observed over the same 67% bandwidth. To demonstrate the applicability of the proposed broadband quadrature hybrid, a continuous phase shifter which is based on the vector sum method is tested. Broadband Quadrature Hybrid Design Using Metamaterial Transmission Line and Its Application in the Broadband Continuous Phase Shifter Cheng-Jung Lee KMKH Leong T Itoh doi:10.1109/MWSYM.2007.380066 Microwave Symposium, 2007. IEEE/MTT-S International (2007), pp. 1745-1748. 2008-05-28T06:41:48-00:00 2007 Microwave Symposium, 2007. IEEE/MTT-S International 1745 1748 broadband crlh metamaterial tl http://www.citeulike.org/user/dcastro/article/2813856 <i>Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE, Vol. 1 (2000), pp. 103-107 vol.1.</i><br /><br />In this paper we present a novel loading algorithm for OFDM-based multiuser communication system to maximize the total system throughput while satisfying the total power and users' rate constraints. The new scheme determines the subcarrier, bit, and power allocation by decoupling an NP-hard combinatorial problem into two steps: (1) resource allocation (how much power and how many subcarriers for each user) based on users' average channel gains and their rate requirements; and (2) subcarrier assignment and bit loading based on users' channel profiles across all subcarriers. Compared to existing iterative methods, the two-step approach offers comparable capacity gain with much lower complexity An efficient multiuser loading algorithm for OFDM-based broadband wireless systems H Yin H Liu doi:10.1109/GLOCOM.2000.891705 Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE, Vol. 1 (2000), pp. 103-107 vol.1. 2008-05-19T18:32:45-00:00 2000 Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE 1 103 107 vol.1 allocation broadband ofdm power wireless http://www.citeulike.org/user/dcastro/article/2809072 <i>Microwave Conference, 2007. European (2007), pp. 466-469.</i><br /><br />In this paper, a broadband balun using an active circuit with negative group delay (NGD) is proposed. The unit cell of the active NGD circuit is based on a Field Effect Transistor (FET) in cascade with an RLC series network. First, a comparison between measurements of a two-stage prototype of this active topology and simulations validate the synthesis method of this innovative device. Then, thanks to the NGD circuit, a constant phase can be generated if this circuit is associated with a classical transmission line. By implementing such phase shifters into the two branches of a resistive splitter, we obtain a new balun topology. The NGD balun simulation results show a rather constant differential output phase (180degplusmn9deg), insertion losses above -2.4 dB and an excellent isolation below -59 dB for all three ports, for a bandwidth from 3.5 GHz to 5.5 GHz. Broadband balun using active negative group delay circuit B Ravelo A Perennec M Le Roy doi:10.1109/EUMC.2007.4405228 Microwave Conference, 2007. European (2007), pp. 466-469. 2008-05-18T14:07:40-00:00 2007 Microwave Conference, 2007. European 466 469 active balun broadband metamaterial http://www.citeulike.org/user/dcastro/article/2801466 <i>Microwave Symposium Digest, 2002 IEEE MTT-S International, Vol. 2 (2002), pp. 1277-1280.</i><br /><br />A compact quadrature modulator/demodulator integrated with a 40 GHz patch antenna for millimeter wave wireless applications is proposed. Anti-parallel diode sub-harmonic mixers are constructed for broad-band direct quadrature conversion. Overall phase and amplitude imbalance between the mixer I and Q output channels are less than 1.2° and 1 dB respectively. An average conversion loss of mixers of -14.6 dB is achieved in the frequency range from 39.75 GHz to 40.25 GHz. A communication link is built based on a pair of the proposed front-ends. Data transmission at up to 1 Gb/s data rate for QPSK modulation is successfully demonstrated Millimeter wave direct quadrature converter integrated with antenna for broad-band wireless communications Ji-Yong Park Seong-Sik Jeon Yuanxun Wang T Itoh doi:10.1109/MWSYM.2002.1011896 Microwave Symposium Digest, 2002 IEEE MTT-S International, Vol. 2 (2002), pp. 1277-1280. 2008-05-15T12:14:54-00:00 2002 Microwave Symposium Digest, 2002 IEEE MTT-S International 2 1277 1280 antenna broadband converter mixer wireless http://www.citeulike.org/user/dcastro/article/2801463 <i>Electronics Letters, Vol. 34, No. 23. (1998), pp. 2194-2196.</i><br /><br />A compact and uniplanar antenna with broadband characteristics is presented. The novel Yagi-like printed dipole array antenna is fed by a microstrip-to-coplanar strip transition, and uses the truncated microstrip ground plane as its reflecting element. An X-band prototype measures a bandwidth of 17%. With 6.5 dB gain, 18 dB front-to-back ratio, and lower than -15 dB cross-polarisation level at 10 GHz Microstrip-fed quasi-Yagi antenna with broadband characteristics Y Qian WR Deal N Kaneda T Itoh Electronics Letters, Vol. 34, No. 23. (1998), pp. 2194-2196. 2008-05-15T12:14:41-00:00 1998 Electronics Letters 34 23 2194 2196 antenna broadband microstrip http://www.citeulike.org/user/dcastro/article/2801361 <i>Microwave Conference, 1999 Asia Pacific, Vol. 1 (1999), pp. 142-145 vol.1.</i><br /><br />A novel printed antenna with broadband circular polarization (CP) characteristics is presented. The antenna design is based on a recently developed uniplanar quasi-Yagi. The antenna measures VSWR<2 and AR<3 dB in the frequency range from 3.40 to 6.34 GHz (60.4%). The bandwidth is more than twice that of the best planar CP antenna to our knowledge. The measured dual-linear pattern at 5 GHz shows that the antenna has excellent CP performance, with its AR below 6 dB over a wide range of scan angles (±80°) from the mainbeam direction A novel printed antenna with broadband circular polarization Yongxi Qian WR Deal J Sor T Itoh doi:10.1109/APMC.1999.828070 Microwave Conference, 1999 Asia Pacific, Vol. 1 (1999), pp. 142-145 vol.1. 2008-05-15T11:29:01-00:00 1999 Microwave Conference, 1999 Asia Pacific 1 142 145 vol.1 antenna broadband circular polarisation printed http://www.citeulike.org/user/dcastro/article/2801356 <i>Radio and Wireless Conference, 1999. RAWCON 99. 1999 IEEE (1999), pp. 231-234.</i><br /><br />An active array with a quasi-Yagi antenna element is presented. The array has a bandwidth of 60% (VSWR <2) and a fan-beam pattern. The gain of the active array is measured to range from 22-25 dB from 8-11.7 GHz. The single layer compact design makes this array antenna ideal as a building block in larger 2-D arrays A broadband uniplanar quasi-Yagi active array for power combining WR Deal J Sor Y Qian T Itoh doi:10.1109/RAWCON.1999.810972 Radio and Wireless Conference, 1999. RAWCON 99. 1999 IEEE (1999), pp. 231-234. 2008-05-15T11:27:42-00:00 1999 Radio and Wireless Conference, 1999. RAWCON 99. 1999 IEEE 231 234 active array broadband combining power http://www.citeulike.org/user/dcastro/article/2801353 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 12. (1999), pp. 2562-2567.</i><br /><br />A novel microstrip-to-waveguide transition utilizing a coplanar-strip Yagi-like antenna is presented. The compact and single-layered quasi-Yagi antenna fabricated on high dielectric-constant substrate has end-fire radiation patterns. This monolithic-microwave integrated-circuit (MMIC)-compatible antenna is inserted in the E-plane of the rectangular waveguide to launch the TE₁₀ dominant mode. With this new scheme of excitation, compact design and low-cost fabrication is achieved without requiring multilayered substrate or backshort hermetic sealing. This transition, in addition, achieves very broad bandwidth and relatively low insertion loss. The transition's broad-band characteristics are analyzed, and optimization guidelines for individual components of the transition are discussed in detail. A tolerance study proves that the transition is robust in mechanical alignment. The X-band transition with alumina substrate demonstrates 35% bandwidth with return loss better than -12- and -0.3-dB insertion loss at the center frequency. This transition should find wide applications due to its high compatibility with microwave-integrated-circuit/MMIC technology and very low fabrication cost A broad-band microstrip-to-waveguide transition using quasi-Yagi antenna N Kaneda Y Qian T Itoh doi:10.1109/22.809007 Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 12. (1999), pp. 2562-2567. 2008-05-15T11:25:48-00:00 1999 Microwave Theory and Techniques, IEEE Transactions on 47 12 2562 2567 antenna broadband microstrip http://www.citeulike.org/user/dcastro/article/2776235 <i>Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters], Vol. 8, No. 1. (1998), pp. 13-14.</i><br /><br />Two class AB GaAs field-effect transistor (FET) power amplifiers have been designed and fabricated in the 4.4-4.8 GHz range. In the first case, a dielectric PBG line was incorporated in the design to tune the second harmonic. In the second case, a 50-Ω line is used with no harmonic tuning. The PBG structure allows broad-band harmonic tuning and is inexpensive to fabricate. A 5% improvement in power-added efficiency was achieved at the design frequency of 4.5 GHz, in both simulation and measurement Broad-band power amplifier using dielectric photonic bandgap structure V Radisic Y Qian T Itoh doi:10.1109/75.650973 Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters], Vol. 8, No. 1. (1998), pp. 13-14. 2008-05-09T16:12:55-00:00 1998 Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters] 8 1 13 14 amplifier broadband pbg power http://www.citeulike.org/user/dcastro/article/2776171 <i>Communications Magazine, IEEE, Vol. 35, No. 1. (1997), pp. 28-33.</i><br /><br />A brief overview of wireless broadband communication systems, those providing a data rate higher than 2 Mb/s and up to 155 Mb/s, is done by addressing some of the applications and services that are foreseen, as well as some of the technical challenges that need to be solved, and by referring to some safety considerations. After an introduction, the need for high data rates is justified, and possible applications are listed and compared, concerning user mobility and bandwidth. Then an analysis of the propagation aspects at the bands foreseen for these systems-microwaves, millimeter waves and infrared-is presented, also addressing the issue of the antennas and batteries for these systems An overview of wireless broadband communications LM Correia R Prasad doi:10.1109/35.568195 Communications Magazine, IEEE, Vol. 35, No. 1. (1997), pp. 28-33. 2008-05-09T15:41:49-00:00 1997 Communications Magazine, IEEE 35 1 28 33 broadband communication overview wireless http://www.citeulike.org/user/dcastro/article/2768746 <i>Antennas and Propagation, IEEE Transactions on, Vol. 50, No. 8. (2002), pp. 1158-1160.</i><br /><br />A novel broadband planar antenna based on the classic Yagi-Uda dipole array is presented. This "quasi-Yagi" antenna achieves a measured 48% bandwidth for VSWR <2, better than 12 dB front-to-back ratio, smaller than -15 dB cross polarization, 3-5 dB absolute gain and a nominal efficiency of 93% across the operating bandwidth. Finite-difference time-domain simulation is used for optimization of the antenna and the results agree very well with measurements. Additionally, a gain-enhanced design is presented, where higher gain has been achieved at the cost of reduced bandwidth. These quasi-Yagi antennas are realized on a high dielectric constant substrate and are completely compatible with microstrip circuitry and solid-state devices. The excellent radiation properties of this antenna make it ideal as either a stand-alone antenna with a broad pattern or as an array element. The antenna should find wide applications in wireless communication systems, power combining, phased arrays and active arrays, as well as millimeter-wave imaging arrays. A broadband planar quasi-Yagi antenna N Kaneda WR Deal Yongxi Qian R Waterhouse T Itoh doi:10.1109/TAP.2002.801299 Antennas and Propagation, IEEE Transactions on, Vol. 50, No. 8. (2002), pp. 1158-1160. 2008-05-08T07:28:52-00:00 2002 Antennas and Propagation, IEEE Transactions on 50 8 1158 1160 antenna broadband planar http://www.citeulike.org/user/dcastro/article/2768647 <i>Microwaves, Radar and Wireless Communications. 2000. MIKON-2000. 13th International Conference on, Vol. 2 (2000), pp. 525-528 vol.2.</i><br /><br />General structures and a classification of prototypes (for about 250 networks) for broadband microwave filters and matching networks for given complex load are presented. The peculiarities of synthesis methods, theoretical limitations and properties of input impedance for singly terminated and double terminated networks and frequency diplexers are described. Results of a computer simulation of frequency characteristics for different broadband filters and matching networks are presented Structures of prototypes for broadband microwave filters, diplexers and matching networks G Czawka doi:10.1109/MIKON.2000.913987 Microwaves, Radar and Wireless Communications. 2000. MIKON-2000. 13th International Conference on, Vol. 2 (2000), pp. 525-528 vol.2. 2008-05-08T06:36:11-00:00 2000 Microwaves, Radar and Wireless Communications. 2000. MIKON-2000. 13th International Conference on 2 525 528 vol.2 broadband diplexer filter matching microwave http://www.citeulike.org/user/dcastro/article/2768645 <i>Antennas and Propagation, IEEE Transactions on, Vol. 50, No. 12. (2002), pp. 1697-1705.</i><br /><br />An ultra broadband printed (UBP) antenna is presented which consists of a diplexer and two aperture stacked patch antennas. S-parameter theory is used to investigate the input impedance behavior of the UBP antenna. This antenna can produce a 10-dB return loss bandwidth of almost 120% with constant gain of 6.5 dB. A relatively uniform radiation pattern over the entire band was also achieved. Ultrabroadband printed (UBP) antenna K Ghorbani RB Waterhouse doi:10.1109/TAP.2002.807423 Antennas and Propagation, IEEE Transactions on, Vol. 50, No. 12. (2002), pp. 1697-1705. 2008-05-08T06:36:05-00:00 2002 Antennas and Propagation, IEEE Transactions on 50 12 1697 1705 antenna broadband printed http://www.citeulike.org/user/dcastro/article/2762269 <i>Microwave Symposium Digest, 1993., IEEE MTT-S International (1993), pp. 585-588 vol.2.</i><br /><br />A novel uniplanar hybrid ring coupler using coplanar waveguide (CPW) and slotline is presented. The coupler provides substantially improved amplitude and phase characteristics over a broad bandwidth compared to the conventional microstrip hybrid ring couplers. Experimental results show that the new coupler has a bandwidth of one octave from 2 GHz to 4 GHz with a +or-0.25-dB power dividing balance and a +or-1 degrees phase balance.<<ETX>> A broad-band uniplanar slotline hybrid ring coupler with over one octave bandwidth CH Ho L Fan K Chang doi:10.1109/MWSYM.1993.276870 Microwave Symposium Digest, 1993., IEEE MTT-S International (1993), pp. 585-588 vol.2. 2008-05-06T18:38:50-00:00 1993 Microwave Symposium Digest, 1993., IEEE MTT-S International 585 588 vol.2 broadband coupler http://www.citeulike.org/user/dcastro/article/2762267 <i>Antennas and Propagation, IEEE Transactions on, Vol. 51, No. 10. (2003), pp. 3006-3009.</i><br /><br />A novel single-feed broadband circularly polarized patch antenna is proposed. The proposed antenna has a simple structure, consisting of a corner-truncated square radiating patch, an L-shaped ground plane, and a probe feed. Through a via hole in the vertical ground of the L-shaped ground plane, the radiating patch is easily excited by a probe feed oriented in the same plane as the patch, and circular polarization (CP) radiation over a wide frequency range (>10%) is achieved. Experimental results of a constructed prototype with the center operating frequency at about 2500 MHz showed that the antenna has an impedance bandwidth (1.5:1 VSWR) of about 30%, a 3-dB axial-ratio CP bandwidth of about 10.4%, and a gain level of 8.5 dBi or larger within the CP bandwidth. In addition to the low cost of the proposed antenna due to its simple structure, the obtained CP performance is among the best that have been reported for single-feed single-element patch antennas. Low-cost broadband circularly polarized patch antenna Fa-Shian Chang Kin-Lu Wong Tzung-Wern Chiou doi:10.1109/TAP.2003.818010 Antennas and Propagation, IEEE Transactions on, Vol. 51, No. 10. (2003), pp. 3006-3009. 2008-05-06T18:38:45-00:00 2003 Antennas and Propagation, IEEE Transactions on 51 10 3006 3009 antenna broadband circularly patch polarisation http://www.citeulike.org/user/dcastro/article/2762240 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 39, No. 12. (1991), pp. 1980-1986.</i><br /><br />The design and fabrication of four broadband monolithic passive baluns including CPW Marchand, multilayer MS Marchand, planar-transformer and broadside-coupled line baluns are presented. Operational frequencies range from 1.5 GHz to 24 GHz. Maximum relative bandwidths in excess of 3:1 are achieved. Simulated performances using full wave electromagnetic analysis are shown to agree with the measured results. Two accurate equivalent circuit models constructed from either electromagnetic simulated or measured S-parameters are developed for the MS Marchand and transformer baluns making the optimization of baluns and circuit design using the baluns much more efficient. The design of monolithic double-balanced diode mixer using two planar-transformer baluns is also presented. Without DC bias, the mixer shows a minimum conversion loss of 6 dB with the RF at 5 GHz and a LO drive of 15 dBm at 4 GHz. The measured input IP₃ of this mixer is better than 15 dBm over the 4 to 5.75 GHz frequency band Broadband monolithic passive baluns and monolithic double-balanced mixer Chen KW Chang SB Bui H Wang GS Dow LCT Liu TS Lin WS Titus doi:10.1109/22.106536 Microwave Theory and Techniques, IEEE Transactions on, Vol. 39, No. 12. (1991), pp. 1980-1986. 2008-05-06T18:33:19-00:00 1991 Microwave Theory and Techniques, IEEE Transactions on 39 12 1980 1986 balanced balun broadband mixer passive http://www.citeulike.org/user/dcastro/article/2762221 <i>Electrical Performance of Electronic Packaging, 1998. IEEE 7th topical Meeting on (1998), pp. 79-82.</i><br /><br />A novel interconnect and packaging concept for high-density, broadband mixed signal silicon MMICs is presented. Compared to conventional microstrip or stripline-based structures, the proposed silicon/metal/polyimide (SIMPOL) interconnect is very promising for extremely high isolation (>100 dB) between adjacent channels from DC up to 50 GHz, as indicated by simulations using a pre-verified full-wave FDTD code A novel high isolation interconnect for broadband mixed signal silicon MMICs Y Qian MF Chang T Itoh doi:10.1109/EPEP.1998.733839 Electrical Performance of Electronic Packaging, 1998. IEEE 7th topical Meeting on (1998), pp. 79-82. 2008-05-06T18:30:49-00:00 1998 Electrical Performance of Electronic Packaging, 1998. IEEE 7th topical Meeting on 79 82 broadband mixer http://www.citeulike.org/user/dcastro/article/2762217 <i>Microwave Symposium Digest, 1999 IEEE MTT-S International, Vol. 4 (1999), pp. 1419-1422 vol.4.</i><br /><br />This paper reports a novel technique for high efficiency and broadband excitation of the first higher order leaky mode in microstrips. A uniplanar microstrip-to-CPS transition is employed to launch the odd leaky mode, and the mode purity is enhanced by suppressing the even fundamental mode using an optimized mode suppressor. An X-band prototype demonstrates excellent mode conversion efficiency as predicted by simulations. A record bandwidth of 20.2% is achieved for a microstrip leaky-wave source based on this newly proposed structure High efficiency and broadband excitation of leaky mode in microstrip structures Y Qian BCC Chang T Itoh KC Chen CKC Tzuang doi:10.1109/MWSYM.1999.780215 Microwave Symposium Digest, 1999 IEEE MTT-S International, Vol. 4 (1999), pp. 1419-1422 vol.4. 2008-05-06T18:28:46-00:00 1999 Microwave Symposium Digest, 1999 IEEE MTT-S International 4 1419 1422 vol.4 antenna broadband microstrip http://www.citeulike.org/user/dcastro/article/2762101 <i>Antennas and Propagation Society International Symposium, 1978, Vol. 16 (1978), pp. 268-272.</i> Broadband microstrip resonator antennas H Pues J Vandensande A Van de Capelle K Leuven Antennas and Propagation Society International Symposium, 1978, Vol. 16 (1978), pp. 268-272. 2008-05-06T17:19:02-00:00 1978 Antennas and Propagation Society International Symposium, 1978 16 268 272 antennas broadband microstrip resonator http://www.citeulike.org/user/dcastro/article/2762099 <i>Antennas and Propagation, IEEE Transactions on, Vol. 42, No. 2. (1994), pp. 129-136.</i><br /><br />A new approach is proposed to increase the bandwidth of microstrip antennas by designing the impedance matching network with the simplified real frequency technique. The most significant feature of this numerical technique is that it does not require any analytical description of the antenna and generator, the measured or simulated impedance data are processed directly. Furthermore, neither an a priori choice of a matching network topology nor an analytic form of the system transfer function is needed. The matching network realized with this technique is generally simple and gives superior gain properties compared to that obtained by other methods. Two representative design examples of microstrip antennas with different bandwidth show the validity of the design procedure Broadband microstrip antenna design with the simplified real frequency technique Hongming An BKJC Nauwelaers AR van de Capelle doi:10.1109/8.277206 Antennas and Propagation, IEEE Transactions on, Vol. 42, No. 2. (1994), pp. 129-136. 2008-05-06T17:18:59-00:00 1994 Antennas and Propagation, IEEE Transactions on 42 2 129 136 antenna broadband design microstrip http://www.citeulike.org/user/dcastro/article/2762095 <i>Electronics Letters, Vol. 27, No. 25. (1991), pp. 2378-2379.</i><br /><br />The design is presented of active microstrip array elements by the combination of active devices with radiating patches to obtain broad bandwidth and extra power gain. The design is illustrated with an active microstrip transmit antenna in a two sided structure. In terms of the realised gain with a flatness of ±0.45 dB, a bandwidth of 24% of the centre frequency was achieved. The results are very attractive for broadband MIC active array design Broadband active microstrip array elements H An B Nauwelaers A Van De Capelle Electronics Letters, Vol. 27, No. 25. (1991), pp. 2378-2379. 2008-05-06T17:16:19-00:00 1991 Electronics Letters 27 25 2378 2379 active antenna array broadband microstrip http://www.citeulike.org/user/dcastro/article/2762094 <i>Antennas and Propagation, IEEE Transactions on, Vol. 42, No. 12. (1994), pp. 1612-1619.</i><br /><br />This paper deals with the design of broadband active microstrip antennas where the amplifier is integrated with the radiator. Theoretically sound definitions for gain and noise figure of the active antenna are introduced, and their relationships with the definitions for the composing circuit and radiator parts are explained. A sequential design procedure is presented that allows the straightforward and optimal design of transmitting and receiving antennas with multiple active stages, taking into account input and output matching, the gain-versus-frequency curve as well as the noise performance. The theoretical concepts are illustrated with two examples: one of a transmitting active antenna and one of a receiving antenna. The former one is a two-stage design that achieves nearly 25% of bandwidth with regard to gain and matching and 24 dB gain improvement as compared to the matched passive antenna. The second one is a receiving antenna (one stage) with a measured noise figure of 1.2 dB in a bandwidth of over 17% and a gain improvement of 11.9 dB over the corresponding passive antenna. Finally co- and cross-polar radiation patterns in E- and H-plane prove that the antennas also have favorable radiation characteristics in a wide bandwidth (at least 18%) Broadband active microstrip antenna design with the simplified real frequency technique Hongming An BKJC Nauwelaers AR Van de Capelle doi:10.1109/8.362813 Antennas and Propagation, IEEE Transactions on, Vol. 42, No. 12. (1994), pp. 1612-1619. 2008-05-06T17:16:14-00:00 1994 Antennas and Propagation, IEEE Transactions on 42 12 1612 1619 active antenna broadband design microstrip http://www.citeulike.org/user/dcastro/article/2762092 <i>Electronics Letters, Vol. 34, No. 1. (1998), pp. 3-4.</i><br /><br />A micromachined rectangular cavity-backed microstrip patch antenna has been developed on high resistivity silicon wafers. This novel path antenna has a much reduced effective dielectric constant and wide bandwidth Broadband microstrip patch antenna on micromachined silicon substrates M Zheng Q Chen PS Hall VF Fusco Electronics Letters, Vol. 34, No. 1. (1998), pp. 3-4. 2008-05-06T17:16:11-00:00 1998 Electronics Letters 34 1 3 4 antenna broadband microstrip patch http://www.citeulike.org/user/dcastro/article/2762091 <i>Electronics Letters, Vol. 34, No. 15. (1998), pp. 1442-1443.</i><br /><br />The characteristics of a rectangular microstrip antenna with an L-shaped probe are investigated. A foam layer with a thickness of around 10% of the wavelength is used as the supporting substrate. An impedance bandwidth of 35% and an average gain of 7.5 dBi can be achieved. The radiation pattern is stable across the passband Broadband microstrip patch antenna KM Luk CL Mak YL Chow KF Lee Electronics Letters, Vol. 34, No. 15. (1998), pp. 1442-1443. 2008-05-06T17:16:02-00:00 1998 Electronics Letters 34 15 1442 1443 antenna broadband microstrip patch http://www.citeulike.org/user/dcastro/article/2709629 <i>Signal Processing Advances in Wireless Communications, 2007. SPAWC 2007. IEEE 8th Workshop on (2007), pp. 1-5.</i><br /><br />This paper proposes a practical receiver cancellation technique for removing nonlinear power amplifier (PA) distortion in OFDM systems. By performing the estimation of the PA model parameters at the receiver, the implementation complexity of the transmitter can be reduced. Furthermore, a simple adaptation rule is provided to enable tracking of the PA model parameters. As a consequence, cancellation of nonlinear distortion can be achieved without assuming that the PA model is known a priori at the receiver. Simulation results show that good levels of distortion cancellation are possible for a system with a broadband PA with memory. Broadband powerr amplifier distortion cancellation with model estimation inthe receiver Fernando Gregorio Stefan Werner Juan Cousseau Risto Wichman doi:10.1109/SPAWC.2007.4401407 Signal Processing Advances in Wireless Communications, 2007. SPAWC 2007. IEEE 8th Workshop on (2007), pp. 1-5. 2008-04-23T17:41:26-00:00 2007 Signal Processing Advances in Wireless Communications, 2007. SPAWC 2007. IEEE 8th Workshop on 1 5 amplifier broadband power receiver http://www.citeulike.org/user/dcastro/article/2693241 <i>Communications Magazine, IEEE, Vol. 35, No. 1. (1997), pp. 20-26.</i><br /><br />This article reviews the technologies and potential markets, applications, and architectures for broadband wireless access. The emergence of wireless communications for cellular systems is presented, together with its projected future evolution to mobile wideband systems. The field of broadband access systems, services, and network architectures is also covered, and then systems for broadband wireless communications for indoor local area networks and outdoor public fixed access networks are discussed. Broadband wireless access systems are emerging as a new and growing area of telecommunications, since the ability to provide access without extensive installation of copper or fiber infrastructures make wireless technology well suited for broadband services. Finally, some of the key enabling technologies, such as adaptive antennas and video compression, and the future architectural directions of broadband wireless networks are presented Broadband wireless access W Honcharenko JP Kruys DY Lee NJ Shah doi:10.1109/35.568192 Communications Magazine, IEEE, Vol. 35, No. 1. (1997), pp. 20-26. 2008-04-20T16:24:02-00:00 1997 Communications Magazine, IEEE 35 1 20 26 access broadband wireless http://www.citeulike.org/user/dcastro/article/1486099 <i>Communications Magazine, IEEE, Vol. 40, No. 9. (2002), pp. 143-149.</i><br /><br />Increasing demand for high-performance 4G broadband wireless is enabled by the use of multiple antennas at both base station and subscriber ends. Multiple antenna technologies enable high capacities suited for Internet and multimedia services, and also dramatically increase range and reliability. In this article we describe a multiple-input multiple-output OFDM wireless communication system, lab test results, and field test results obtained in San Jose, California. These are the first MIMO system field tests to establish the performance of MIMO communication systems. Increased capacity, coverage, and reliability are clearly evident from the test results presented in this article A fourth-generation MIMO-OFDM broadband wireless system: design, performance, and field trial results H Sampath S Talwar J Tellado V Erceg A Paulraj Communications Magazine, IEEE, Vol. 40, No. 9. (2002), pp. 143-149. 2007-07-25T17:40:14-00:00 2002 Communications Magazine, IEEE 40 9 143 149 broadband mimo ofdm system wireless http://www.citeulike.org/user/dcastro/article/2011716 <i>Proceedings of the IEEE, Vol. 92, No. 2. (2004), pp. 271-294.</i><br /><br />Orthogonal frequency division multiplexing (OFDM) is a popular method for high data rate wireless transmission. OFDM may be combined with antenna arrays at the transmitter and receiver to increase the diversity gain and/or to enhance the system capacity on time-varying and frequency-selective channels, resulting in a multiple-input multiple-output (MIMO) configuration. The paper explores various physical layer research challenges in MIMO-OFDM system design, including physical channel measurements and modeling, analog beam forming techniques using adaptive antenna arrays, space-time techniques for MIMO-OFDM, error control coding techniques, OFDM preamble and packet design, and signal processing algorithms used to perform time and frequency synchronization, channel estimation, and channel tracking in MIMO-OFDM systems. Finally, the paper considers a software radio implementation of MIMO-OFDM. Broadband MIMO-OFDM wireless communications GL Stuber JR Barry SW Mclaughlin Ye Li MA Ingram TG Pratt doi:10.1109/JPROC.2003.821912 Proceedings of the IEEE, Vol. 92, No. 2. (2004), pp. 271-294. 2007-11-29T08:18:26-00:00 2004 Proceedings of the IEEE 92 2 271 294 broadband communication mimo ofdm wireless http://www.citeulike.org/user/dcastro/article/2648146 <i>Solid-State and Integrated Circuit Technology, 2006. ICSICT '06. 8th International Conference on (2006), pp. 1565-1567.</i><br /><br />A GaAs solid state passive coplanar waveguide (CPW) left-handed metamaterial medium is proposed and validated by measured results. The unit cell of the fabricated structures has a size of 0.09 mm². The left handedness range of the solid state left-handed structure extends from 2.3 GHz to 17.5 GHz. The compactness and broad left-handed operating bandwidth make the presented left-handed metamaterial be well incorporated with RF/MMIC applications Compact and Broadband Coplanar Waveguide Left-Handed Metamaterial Transmission Line for RF/ MICC Application Wei Tong ZR Hu P Curtis M Missous doi:10.1109/ICSICT.2006.306290 Solid-State and Integrated Circuit Technology, 2006. ICSICT '06. 8th International Conference on (2006), pp. 1565-1567. 2008-04-10T06:42:12-00:00 2006 Solid-State and Integrated Circuit Technology, 2006. ICSICT '06. 8th International Conference on 1565 1567 broadband compact coplanar lh metamaterial tl http://www.citeulike.org/user/dcastro/article/2636971 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 56, No. 1. (2008), pp. 56-64.</i><br /><br />The active integrated antenna (AIA) concept has been applied to design a broadband receiver front-end. A design procedure for active broadband patch antennas based on resistive equalization is presented. The use of the AIA has allowed the design of efficient RF front-ends by increasing its effective gain, noise figure, and merit . In addition to improving the classical parameters, the resistive equalization technique allows enlarging the bandwidths of the active antenna parameters versus the corresponding ones in passive antennas. A receiving patch antenna (with one amplifying stage) with a measured noise figure lower than 0.6 dB in a bandwidth over 38% and an effective gain improvement of 13 dB over the corresponding passive antenna has been achieved. The -parameter has also been measured for both the active and passive antenna, resulting in a relative planar of 16 dB/K, with a ripple of 0.5 dB, over a 30% bandwidth for the active antenna versus a of 22 dB/K for a typical front-end with a passive antenna over 20% bandwidth. Broadband Active Receiving Patch With Resistive Equalization D Segovia-Vargas D Castro-Galan LE Garcia-Munoz V Gonzalez-Posadas doi:10.1109/TMTT.2007.912008 Microwave Theory and Techniques, IEEE Transactions on, Vol. 56, No. 1. (2008), pp. 56-64. 2008-04-07T09:36:06-00:00 2008 Microwave Theory and Techniques, IEEE Transactions on 56 1 56 64 active antenna broadband patch receiving tesis http://www.citeulike.org/user/dcastro/article/2619443 <i>Antennas and Propagation Society International Symposium 2006, IEEE (2006), pp. 1631-1634.</i><br /><br />The demand for broadband wireless communication is rapidly increasing due to the need to support more users and to provide more information with higher data rates. Wideband antennas are essential front-end elements for broadband wireless communications. In several applications, it is also desirable for broadband antennas to have dual-polarization, especially for advanced wireless communication systems employing diversity and MIMO techniques. Most broadband antennas reported in the literature are forms of monopole, dipole, or crossed-dipole antennas. This paper summarizes broadband antennas and proposes an evolution process from the monopole disc antennas to broadband dual-polarized antennas. Evolution of broadband antennas from monopole disc to dual-polarized antenna Seong-Youp Suh AE Waltho VK Nair WL Stutzman WA Davis doi:10.1109/APS.2006.1710872 Antennas and Propagation Society International Symposium 2006, IEEE (2006), pp. 1631-1634. 2008-04-01T11:05:31-00:00 2006 Antennas and Propagation Society International Symposium 2006, IEEE 1631 1634 antenna broadband http://www.citeulike.org/user/dcastro/article/2011407 <i>Communications Magazine, IEEE, Vol. 43, No. 1. (2005), pp. 53-60.</i><br /><br />Orthogonal frequency-division multiplexing is a popular method for high-data-rate wireless transmission. OFDM may be combined with multiple antennas at both the access point and mobile terminal to increase diversity gain and/or enhance system capacity on a time-varying multipath fading channel, resulting in a multiple-input multiple-output OFDM system. In this article we give a brief technical overview of MIMO-OFDM system design. We focus on various research topics for the MIMO-OFDM-based air interface, including spatial channel modeling, MIMO-OFDM transceiver design, MIMO-OFDM channel estimation, space-time techniques for MIMO-OFDM, and error correction code. The corresponding link-level simulation results are encouraging, and show that MIMO-OFDM is a promising road to future broadband wireless access. A road to future broadband wireless access: MIMO-OFDM-Based air interface Hongwei Yang doi:10.1109/MCOM.2005.1381875(410) 4 Communications Magazine, IEEE, Vol. 43, No. 1. (2005), pp. 53-60. 2007-11-29T07:26:01-00:00 2005 Communications Magazine, IEEE 43 1 53 60 broadband mimo ofdm wireless http://www.citeulike.org/user/dcastro/article/2426152 <i>Communications Magazine, IEEE, Vol. 37, No. 11. (1999), pp. 100-105.</i><br /><br />This article is an overview of smart antenna applications in fixed broadband wireless access networks. Different smart antenna techniques are described including advances such as “spatial multiplexing” that can dramatically increase the performance of BWA networks. The impact of SA techniques on capacity and throughput of BWA networks is discussed Smart antennas for broadband wireless access networks K Sheikh D Gesbert D Gore A Paulraj doi:10.1109/35.803658 Communications Magazine, IEEE, Vol. 37, No. 11. (1999), pp. 100-105. 2008-02-25T17:52:04-00:00 1999 Communications Magazine, IEEE 37 11 100 105 antenna broadband smart wireless http://www.citeulike.org/user/dcastro/article/2426151 <i>Communications Magazine, IEEE, Vol. 40, No. 4. (2002), pp. 76-83.</i><br /><br />Broadband wireless access along with evolving mobile Internet and multimedia services are driving the surge of research and development activities for future wireless communication systems. We provide an overview of antenna systems for broadband wireless communications and introduce some of the important issues surrounding them. The approach we use is to first provide a general framework of how antenna systems may be utilized in wireless communication systems and then describe the antenna systems themselves. In particular, we consider antenna systems for the base station, mobile station, and then finally multiple-input multiple-output antenna systems where antenna systems are utilized at both the base and mobile stations Antenna systems for broadband wireless access RD Murch KB Letaief doi:10.1109/35.995854 Communications Magazine, IEEE, Vol. 40, No. 4. (2002), pp. 76-83. 2008-02-25T17:51:38-00:00 2002 Communications Magazine, IEEE 40 4 76 83 access antenna broadband wireless