Sat, 26 Jul 2008 06:06:29 BST CiteULike: dcastro's analysis http://www.citeulike.org/user/dcastro/tag/analysis CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/3015404 <i>Microwave Conference, 2006. APMC 2006. Asia-Pacific (2006), pp. 953-956.</i><br /><br />The trend of microwave circuits has been toward highly integrated systems. Most design tools for circuits are based on the fundamental circuit theory using the S-matrix combined with the harmonic-balance method. Consequently, the electromagnetic effect is ignored or approximated at best. Therefore, the extended finite-difference time-domain (FDTD) method combined with the equivalent circuit simulation had been presented. However, it takes very long times to analyze any circuits. In this paper, we propose a novel extended FDTD method to reduce calculation resources. We investigate its efficiency to compare with the conventional extended FDTD method or measurements, consequently, it is confirmed that the proposal method is required calculation resources less than 10% compared with the conventional method. We also show that the proposal method is able to analyze characteristics of the active integrated antenna(AIA) which are practicably impossible to analyze by using the conventional method. A novel extended FDTD method for the analysis of the active integrated circuit and antenna mounted non- linear devices N Kawashima K Fujimori M Sanagi S Nogi doi:10.1109/APMC.2006.4429570 Microwave Conference, 2006. APMC 2006. Asia-Pacific (2006), pp. 953-956. 2008-07-17T19:46:55-00:00 2006 Microwave Conference, 2006. APMC 2006. Asia-Pacific 953 956 active amplifier analysis antenna fdtd http://www.citeulike.org/user/dcastro/article/2923558 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 11, No. 3. (1963), pp. 216-225.</i><br /><br />Analysis of antennas immersed in conducting media is, in many ways, quite different from the corresponding analysis for antennas in air. The usual simple techniques applied for determining radiation resistance for antennas in the air break down for antennas in conducting media. The normal concepts of antenna gain and antenna pattern break down when the antenna is in a conducting medium. The pattern, for example, becomes highly dependent upon the choice of the origin of the coordinate system. These effects are due to the dissipation of most of the energy in the immediate vicinity of the antenna. Such dissipation is caused by the fields which, for antennas in air, are associated with stored, but not dissipated, energy. The primary purpose of this paper is to illustrate failure of standard antenna analysis techniques when the antennas are in conducting media. Surprisingly, the biconical antenna, whose input impedance requires rather extensive calculations in air, turns out to be extremely simple to analyze in a conducting medium. A discussion of this is presented to show how an analysis can be simplified by the presence of the conducting medium. Comparison of a redefined gain for the biconical, loop, and two forms of straight wire antennas, indicates that there is very little difference between the gains of the different configurations provided the sizes are approximately the same. Although the loop antenna is considered only for dimensions small compared with the wavelength, no such limitation is placed on the other antennas. Effects of a surrounding conducting medium on antenna analysis R Moore Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 11, No. 3. (1963), pp. 216-225. 2008-06-24T12:40:58-00:00 1963 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 11 3 216 225 analysis antenna http://www.citeulike.org/user/dcastro/article/2883732 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 29, No. 1. (1981), pp. 63-68.</i><br /><br />A method for analyzing characterisitcs of open microstrip disk structures is presented. The method is based on the spectral domain immittance matrix approach, and all the wave phenomena associated with the structures are incorporated. The method provides a number of unique and convenient features both in analytical and numerical phases. A numerical example illustrating the usefulness of the method is included. Some numerical results are compared with experimental data. A full-wave analysis method for open microstrip structures T Itoh W Menzel Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 29, No. 1. (1981), pp. 63-68. 2008-06-11T20:18:23-00:00 1981 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 29 1 63 68 analysis antenna microstrip http://www.citeulike.org/user/dcastro/article/2877936 <i>Aerospace and Electronic Systems, IEEE Transactions on, Vol. 31, No. 2. (1995), pp. 739-751.</i><br /><br />In this paper, a digital system for the Global Positioning System (GPS) pseudo-range observable is modeled and analyzed theoretically. The observable is measured in a GPS receiver by accurately tracking the pseudorandom noise (PRN) code phase of the input GPS signal using a digital energy detector and a digital delay lock loop (DDLL). The following issues are presented: (1) mathematical modeling of the digital PRN code acquisition and tracking system, (2) the closed-form expression derivation for the detection and false-alarm probabilities of the acquisition process and for the variance of code phase tracking error, and (3) the linear and nonlinear performance analysis of the DDLL for optimizing the receiver structures and parameters with tradeoff between the tracking errors due to receiver dynamics and due to input noise Modeling and analysis for the GPS pseudo-range observable Weihua Zhuang J Tranquilla doi:10.1109/7.381921 Aerospace and Electronic Systems, IEEE Transactions on, Vol. 31, No. 2. (1995), pp. 739-751. 2008-06-09T19:24:45-00:00 1995 Aerospace and Electronic Systems, IEEE Transactions on 31 2 739 751 analysis gps http://www.citeulike.org/user/dcastro/article/2860987 <i>Bell Labs Technical Journal, Vol. 11, No. 4. (2007)</i><br /><br />IEEE 802.16e has emerged as a strong candidate standard for future wireless systems primarily because it offers the potential for high spectral efficiency, flexible spectrum options (e.g., 2-6 GHz), scalable carrier bandwidth options (e.g., from 1.25 MHz to 20 MHz), multiple duplexing options (time and frequency division duplex), various subchannelization options, and, unlike its IEEE 802.16 predecessors, mobility. Because of the recent emergence of IEEE 802.16e and the complexity it poses in system analysis, there is little published work in the literature regarding the actual system capacity/ throughput performance of IEEE 802.16e for high data rate services. In this paper, we investigate the link and system level performance on the downlink of an IEEE 802.16e-based orthogonal frequency division multiple access (OFDMA) communication system and provide recommendations on high performance IEEE 802.16e system design and deployment configurations. We also propose dynamic resource allocation methods that may be used in OFDMA systems and investigate their performance. @ 2007 Alcatel-Lucent. Design and analysis of an IEEE 802.16e-based OFDMA communication system Krishna Balachandran Doru Calin Fang-Chen Cheng Niranjan Joshi Joseph Kang Achilles Kogiantis Kurt Rausch Ashok Rudrapatna James Seymour Jonqyin Sun Bell Labs Technical Journal, Vol. 11, No. 4. (2007) 2008-06-04T12:25:17-00:00 2007 Bell Labs Technical Journal 11 4 80216 analysis design ofdma wimax http://www.citeulike.org/user/dcastro/article/2859768 <i>Circuits and Systems II: Express Briefs, IEEE Transactions on [see also Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on], Vol. 54, No. 6. (2007), pp. 474-478.</i><br /><br />Phase-locked loops (PLLs) using binary phase detectors (BPDs) are modeled and analyzed in this paper. Steady-state behavior for PLLs based on BPDs (BPLs) using first- and second- order loop filters is characterized using transient waveform equations. It is shown that BPLL has a range of oscillation modes in steady state when there is no input jitter. The BPLL is most likely to operate at the most stable oscillation mode (MSOM) under the disturbance of random input jitter. The MSOM is determined by evaluating the relative stability of all the modes. The expected value of the output jitter amplitude is derived and its dependence on the loop parameters is analyzed. Steady-State Analysis of Phase-Locked Loops Using Binary Phase Detector Shanfeng Cheng Haitao Tong J Silva-Martinez AI Karsilayan doi:10.1109/TCSII.2007.894429 Circuits and Systems II: Express Briefs, IEEE Transactions on [see also Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on], Vol. 54, No. 6. (2007), pp. 474-478. 2008-06-03T19:01:26-00:00 2007 Circuits and Systems II: Express Briefs, IEEE Transactions on [see also Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on] 54 6 474 478 analysis pll http://www.citeulike.org/user/dcastro/article/2839868 <i>Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2007 International Symposium on (2007), pp. 362-365.</i><br /><br />Left-handed transmission lines (LHTLs) are used in this letter to design a novel Wilkinson power divider. In our design, the lumped L-C LHTLs (-lambda/4) is instead of the right-handed transmission lines which is used as branch arms of the conventional Wilkinson power divider. The simulated results show that the novel power divider has a wide bandwidth of return loss and isolation, and its size is 50% smaller than conventional Wilkinson power dividers. The novel Wilkinson power divider has many advantages over conventional power divider in e. g. the size, weight, simplicity, low insertion loss, bandwidth of isolation, and cost. Analysis and Design of a Power Divider Using Metamaterials Li Jiu-Sheng doi:10.1109/MAPE.2007.4393623 Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2007 International Symposium on (2007), pp. 362-365. 2008-05-28T06:59:33-00:00 2007 Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2007 International Symposium on 362 365 analysis design divider metamaterial power http://www.citeulike.org/user/dcastro/article/2839867 <i>Antennas and Propagation Society International Symposium, 2005 IEEE, Vol. 3B (2005), pp. 2-5 vol. 3B.</i><br /><br />A transmission matrix method (TMM), consisting of a 2D extension of 1D transmission matrix principles, is presented to compute the field distributions in 2D finite-size transmission line (TL) metamaterials (MMs) excited by an arbitrary source. This method, which is an MM generalization and extension of the method introduced by J.-H. Kim and M. Swaminathan (see IEEE Trans. Advanced Packag., vol.24, no.3, p.334-46, 2001) for packaged dense circuits, is a frequency-domain technique. Its main advantage is simplicity. A related, but more sophisticated, technique is the time-domain transmission line method (TLM), which was generalized for MMs by P.P.M. So and W.J.R. Hoefer (see IEEE MTT S Int. Microwave Symp. Dig., p.1779-82, 2004). Analysis 2D finite-size metamaterials by the transmission matrix method C Caloz Chi-Hyung Ahn T Itoh doi:10.1109/APS.2005.1552416 Antennas and Propagation Society International Symposium, 2005 IEEE, Vol. 3B (2005), pp. 2-5 vol. 3B. 2008-05-28T06:59:32-00:00 2005 Antennas and Propagation Society International Symposium, 2005 IEEE 3B 2 5 vol. 3B analysis metamaterial http://www.citeulike.org/user/dcastro/article/2822651 <i>Communications, IEEE Transactions on [legacy, pre - 1988], Vol. 21, No. 6. (1973), pp. 733-738.</i><br /><br />An approach to the analysis of performance of quasioptimum digital phase-locked loops (DPLL's) is presented. An expression for the characteristic function of the prior error in the state estimate is derived, and from this expression an infinite dimensional equation for the prior error variance is obtained. The prior errorvariance equation is a function of the communication system model and the DPLL gain and is independent of the method used to derive the DPLL gain. Two approximations are discussed for reducing the prior error-variance equation to finite dimension. The effectiveness of one approximation in analyzing DPLL performance is studied. An Approach to the Analysis of Performance of Quasi-Optimum Digital Phase-Locked Loops D Polk S Gupta Communications, IEEE Transactions on [legacy, pre - 1988], Vol. 21, No. 6. (1973), pp. 733-738. 2008-05-22T09:26:46-00:00 1973 Communications, IEEE Transactions on [legacy, pre - 1988] 21 6 733 738 analysis dll http://www.citeulike.org/user/dcastro/article/2805153 <i>Information Theory, IEEE Transactions on, Vol. 43, No. 4. (1997), pp. 1245-1253.</i><br /><br />We study the estimation variance performance of the matrix pair (MP) method for estimating the impulse responses of multiple FIR channels driven by an unknown input sequence. A first-order perturbation analysis of the large-data-size performance of the MP method is presented and an explicit expression for the estimation variance is derived. Both the theoretical and simulation results are used to investigate the statistical performance of the MP method and a number of new insights are revealed Performance analysis of the matrix pair method for blind channel identification Wanzhi Qiu Yingbo Hua doi:10.1109/18.605588 Information Theory, IEEE Transactions on, Vol. 43, No. 4. (1997), pp. 1245-1253. 2008-05-16T12:02:03-00:00 1997 Information Theory, IEEE Transactions on 43 4 1245 1253 analysis channel identification performance http://www.citeulike.org/user/dcastro/article/2802243 <i>Communications, IEEE Transactions on, Vol. 47, No. 1. (1999), pp. 33-43.</i><br /><br />Using a simple finite integral representation for the bivariate Rayleigh (1889) cumulative distribution function previously discovered by the authors, we present expressions for the outage probability and average error probability performances of a dual selective diversity system with correlated slow Rayleigh fading either in closed form (in particular for binary differential phase-shift keying) or in terms of a single integral with finite limits and an integrand composed of elementary (exponential and trigonometric) functions. Because of their simple form, these expressions readily allow numerical evaluation for cases of practical interest. The results are also extended to the case of slow Nakagami-m fading using an alternate representation of the generalized Marcum (1950) Q-function A unified performance analysis of digital communication with dual selective combining diversity over correlated Rayleigh and Nakagami-m fading channels MK Simon MS Alouini doi:10.1109/26.747811 Communications, IEEE Transactions on, Vol. 47, No. 1. (1999), pp. 33-43. 2008-05-15T17:57:08-00:00 1999 Communications, IEEE Transactions on 47 1 33 43 analysis channel communication digital diversity dual fading rayleigh http://www.citeulike.org/user/dcastro/article/2801453 <i>Antennas and Propagation, IEEE Transactions on, Vol. 45, No. 8. (1997), pp. 1294-1301.</i><br /><br />The finite-difference time-domain (FDTD) method is used to analyze a dielectric leaky-wave antenna comprising metal strips etched on a rectangular dielectric rod. The radiation patterns of the leaky-wave antenna with and without the transition are determined by using FDTD. The effects of the launching discontinuity on the performance of the antenna are discussed. In addition, the application of the perfectly matched layer (PML) technique to the three-dimensional (3-D) dielectric waveguide and its performance, compared to those of the Mur's (1981) first-order and super-absorbing Mur's first-order absorbing boundary conditions (ABCs) are described. In addition, the effects caused by perturbation on the wave propagation characteristics of dielectric waveguide are also discussed. The FDTD results are verified by a W-band experiment and found to be in good agreement FDTD analysis of a metal-strip-loaded dielectric leaky-wave antenna M Chen B Houshmand T Itoh doi:10.1109/8.611250 Antennas and Propagation, IEEE Transactions on, Vol. 45, No. 8. (1997), pp. 1294-1301. 2008-05-15T12:11:18-00:00 1997 Antennas and Propagation, IEEE Transactions on 45 8 1294 1301 analysis antenna fdtd leaky http://www.citeulike.org/user/dcastro/article/2782020 <i>Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters], Vol. 4, No. 9. (1994), pp. 296-298.</i><br /><br />Coupled FDTD-SPICE simulations are performed for an active antenna problem. The results are comparable to previously published results using FDTD in conjunction with special integration techniques for the nonlinear elements. Some differences occur, and better agreement with experiment is observed for our newer approach. The main advantages are that all of the SPICE device models are directly available for FDTD modeling and the efficient SPICE integration schemes can be used directly. No user intervention is required for either the device models or the integration schemes FDTD analysis of an active antenna VA Thomas Kuok-Mee Ling ME Jones B Toland Jenshan Lin T Itoh doi:10.1109/75.311512 Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters], Vol. 4, No. 9. (1994), pp. 296-298. 2008-05-09T23:49:11-00:00 1994 Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters] 4 9 296 298 active analysis antenna fdtd http://www.citeulike.org/user/dcastro/article/2782019 <i>Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters], Vol. 3, No. 11. (1993), pp. 423-425.</i><br /><br />The FDTD algorithm is extended to perform a theoretical analysis of a two-element active antenna. A description is given of the procedures that were used to produce a stable large signal simulation of the active, nonlinear circuit. Some results are given and a comparison is made with measured data FDTD analysis of an active antenna B Toland J Lin B Houshmand T Itoh doi:10.1109/75.248520 Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters], Vol. 3, No. 11. (1993), pp. 423-425. 2008-05-09T23:49:09-00:00 1993 Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters] 3 11 423 425 active analysis antenna fdtd http://www.citeulike.org/user/dcastro/article/2776271 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 6. (2000), pp. 991-999.</i><br /><br />This paper describes how device simulation may be used for the modeling, analysis, and design of radio-frequency (RF) laterally diffused metal-oxide-semiconductor (LDMOS) transistors. Improvements to device analysis needed to meet the requirements of RF devices are discussed. Key modeling regions of the LDMOS device are explored and important physical effects are characterized. The LDMOS model is compared to dc and small-signal ac measurements for calibration purposes. Using the calibrated model, large-signal accuracy is verified using harmonic distortion simulation, and intermodulation analysis. Predictive analysis and a study of the structure's parasitic components are also presented. Load-pull simulation is used to analyze matching network effects to determine the best choices for device impedance matching Modeling, analysis, and design of RF LDMOS devices using harmonic-balance device simulation FM Rotella G Ma Z Yu RW Dutton doi:10.1109/22.904736 Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 6. (2000), pp. 991-999. 2008-05-09T16:40:12-00:00 2000 Microwave Theory and Techniques, IEEE Transactions on 48 6 991 999 analysis design model rf simulation http://www.citeulike.org/user/dcastro/article/2776060 <i>Microwave and Millimeter Wave Technology, 2002. Proceedings. ICMMT 2002. 2002 3rd International Conference on (2002), pp. 618-621.</i><br /><br />In this paper, a non-linear circuit model of a FET has been incorporated into the finite-difference time-domain (FDTD) method when microwave active antennas are analysed. The FET, operating in class A mode, is biased and its non-linear properties (second harmonics) are investigated in a patch antenna configuration. The algorithm and the simulation results will be useful in the development of high power integrated active antenna modules. FDTD analysis of microwave active antenna including nonlinear model of FET transistor Y Zhang P Gardner H Ghafouri-Shiraz PS Hall Microwave and Millimeter Wave Technology, 2002. Proceedings. ICMMT 2002. 2002 3rd International Conference on (2002), pp. 618-621. 2008-05-09T14:56:17-00:00 2002 Microwave and Millimeter Wave Technology, 2002. Proceedings. ICMMT 2002. 2002 3rd International Conference on 618 621 active analysis antenna fdtd fet microwave model nonlinear http://www.citeulike.org/user/dcastro/article/2774805 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 32, No. 10. (1984), pp. 1101-1107.</i><br /><br />A solution is presented for the problem of an infinite array of microstrip patches fed with short current elements. The input reflection coefficient is calculated versus scan angle in an arbitrary scan plane, and the effects of substrate parameters and grid spacings are considered. The scan blindness phenomenom is observed and discussed in terms of a forced surface wave response. Measurements from waveguide simulators confirm the theory for thin substrates. Analysis of an infinite array of rectangular microstrip patches with idealized probe feeds D Pozar D Schaubert Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 32, No. 10. (1984), pp. 1101-1107. 2008-05-09T08:48:44-00:00 1984 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 32 10 1101 1107 analysis array microstrip patch http://www.citeulike.org/user/dcastro/article/2774719 <i>Research and Development, 2002. SCOReD 2002. Student Conference on (2002), pp. 136-140.</i><br /><br />A study has been done to analyze and design dual band active antennas. Dual band is accomplishing by combining two forms of helical antennas, i.e cylindrical and conical. The antenna has resonant frequencies of 860 MHz and 1800 MHz based on IMT-2000. An empirical equation has been suggested to calculate the resonant frequency of the antenna. Discussions also include the design of a four-port circulator for a resonant frequency of 2 GHz. This circulator has been used to isolate transmit and receive signals using the same antenna. The gain of the dual band antennas was amplified by using a Hewlett Packard MGA 86563 amplifier. The MGA 86563 is a MMIC (monolithic microwave integrated circuit) that offers a low noise figure and excellent gain so that this antenna can act as an active antenna. Using MMIC techniques, the circulator and amplifier can be combined together to be reduced to a small size which is suitable for any mobile communication systems. Analyzing and designing of a dual band active antennas R Omar SIS Hassan doi:10.1109/SCORED.2002.1033076 Research and Development, 2002. SCOReD 2002. Student Conference on (2002), pp. 136-140. 2008-05-09T08:23:38-00:00 2002 Research and Development, 2002. SCOReD 2002. Student Conference on 136 140 active analysis antenna design dual-band http://www.citeulike.org/user/dcastro/article/2774527 <i>Antennas and Propagation Society International Symposium, 2000. IEEE, Vol. 1 (2000), pp. 26-29 vol.1.</i><br /><br />An efficient numerical approach, based on the wave concept combined with the fast iterative procedure using the FFT-algorithm is developed for the analysis and design multilayered electromagnetic coupled microstrip active antennas. Antennas are fed either by an active element printed on the radiating surface or by a coax transmission line through the ground plane. The proposed approach is checked by comparison with available results Full-wave analysis of multilayered electromagnetically coupled microstrip active antennas RS N'gongo R Garcia H Baudrand doi:10.1109/APS.2000.873697 Antennas and Propagation Society International Symposium, 2000. IEEE, Vol. 1 (2000), pp. 26-29 vol.1. 2008-05-09T06:44:47-00:00 2000 Antennas and Propagation Society International Symposium, 2000. IEEE 1 26 29 vol.1 active analysis antenna multilayer http://www.citeulike.org/user/dcastro/article/2762212 <i>RF and Microwave Components for Communication Systems (Digest No.: 1997/126), IEE Colloquium on (1997), pp. 7/1-7/5.</i><br /><br />The FDTD method is a full wave numerical method which has been extended to analyse hybrid systems incorporating lumped elements and semiconductor devices (using equivalent circuits). A simple implementation of a matched gain block in the extended FDTD algorithm is proposed. The behaviour of the gain block is examined through a simple circuit to validate its characteristics. As a test structure of considerable complexity, a novel microstrip active circulator is analysed. Results compared with those obtained using the HP-MDS circuit simulator show good agreement FDTD analysis of microstrip configurations incorporating gain blocks C Kalialakis MJ Cryan P Gardner PS Hall RF and Microwave Components for Communication Systems (Digest No.: 1997/126), IEE Colloquium on (1997), pp. 7/1-7/5. 2008-05-06T18:28:37-00:00 1997 RF and Microwave Components for Communication Systems (Digest No.: 1997/126), IEE Colloquium on 7/1 7/5 analysis fdtd microstrip http://www.citeulike.org/user/dcastro/article/2762206 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 6. (2000), pp. 1017-1023.</i><br /><br />A study on the analysis and design of active integrated antennas based on active quasi-circulators is reported in this paper. The antenna consists of a novel hybrid active circulator and a short-circuited quarter-wavelength microstrip antenna, which combine to form an active antenna with transmit and receive action at the same frequency. A full-wave model of the configuration using the extended finite-difference time-domain method is devised to analyze its operation, to study parasitic electromagnetic coupling effects, and to derive design guidelines. Experimental results for a hybrid model are also presented Analysis and design of integrated active circulator antennas C Kalialakis MJ Cryan PS Hall P Gardner doi:10.1109/22.904739 Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 6. (2000), pp. 1017-1023. 2008-05-06T18:26:27-00:00 2000 Microwave Theory and Techniques, IEEE Transactions on 48 6 1017 1023 active analysis antenna circulator design ntegrated http://www.citeulike.org/user/dcastro/article/2755576 <i>Microwaves, Antennas and Propagation, IEE Proceedings -, Vol. 146, No. 2. (1999), pp. 131-137.</i><br /><br />The paper presents a new hybrid analysis/design scheme where electromagnetic full wave and nonlinear circuit solvers are used in conjunction with an improved Kurokawa (1969) analysis. The full wave solver is the finite-difference time-domain (FDTD) method and is used to extract the scattering parameters (S-parameters) of all passive components and to predict the radiation patterns. The extracted S-parameters are then used in a CAD nonlinear circuit solver to characterise the device line and find an operation point. Note that the effects of the higher order harmonics on the operation point of this active antenna are taken into account by means of the harmonic balance algorithm. To validate the proposed method, an oscillator-type active antenna working at 2.019 GHz is fabricated and tested. It is shown that the calculated and measured results, such as operation frequency and radiation patterns, agree very well Hybrid analysis/design method for active integrated antennas B Erturk RG Rojas P Roblin doi:10.1049/ip-map:19990208 Microwaves, Antennas and Propagation, IEE Proceedings -, Vol. 146, No. 2. (1999), pp. 131-137. 2008-05-05T08:01:13-00:00 1999 Microwaves, Antennas and Propagation, IEE Proceedings - 146 2 131 137 active analysis antenna design integrated http://www.citeulike.org/user/dcastro/article/2674417 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 55, No. 4. (2007), pp. 729-735.</i><br /><br />This paper describes how circuit and system models are derived for antennas from measurement of the input reflection coefficient. Circuit models are used to optimize the antenna performance and to calculate the radiated power and the transfer function of the antenna. System models are then derived for transmitting and receiving antennas. The most important contribution of this study is to show how microwave structures can be integrated into the simulation of digital communication systems. This enables system designers to predict the effect of the microwave subsystem on the digital signals and calculate the resulting bit error rate System and Circuit Models for Microwave Antennas MI Sobhy B Sanz-Izquierdo JC Batchelor doi:10.1109/TMTT.2007.893675 Microwave Theory and Techniques, IEEE Transactions on, Vol. 55, No. 4. (2007), pp. 729-735. 2008-04-15T17:39:59-00:00 2007 Microwave Theory and Techniques, IEEE Transactions on 55 4 729 735 analysis antenna circuit microwave model simulation http://www.citeulike.org/user/dcastro/article/2648155 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 37, No. 12. (1989), pp. 1949-1957.</i><br /><br />The authors present a detailed full-wave analysis of a coplanar waveguide (CPW) and a slotline by the time-domain finite-difference (TD-FD) method. The transient waveforms propagating along the coplanar waveguide and slotline, which are excited by retarded Gaussian pulses, are found in the time domain. After the time-domain field distributions are obtained, frequency-domain parameters such as the effective dielectric constant and the complex characteristic impedance are calculated using Fourier transformations. The results agree well with available theoretical and experimental data over a wide frequency range. The validity of the quasi-TEM assumptions for CPW and slotline analyses is also checked by evaluating the ratios of the longitudinal and transverse field components directly Full-wave analysis of coplanar waveguide and slotline using the time-domain finite-difference method GC Liang YW Liu KK Mei doi:10.1109/22.44107 Microwave Theory and Techniques, IEEE Transactions on, Vol. 37, No. 12. (1989), pp. 1949-1957. 2008-04-10T06:45:10-00:00 1989 Microwave Theory and Techniques, IEEE Transactions on 37 12 1949 1957 analysis coplanar simulation http://www.citeulike.org/user/dcastro/article/2622727 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 24, No. 1. (1976), pp. 53-65.</i><br /><br />The development and application of a numerical technique for the rapid calculation of the far-field radiation patterns of a reflector antenna from either a measured or computed feed pattern are reported. The reflector is defined by the intersection of a cone with any surface of revolution or an offset sector of any surface of revolution. The feed is assumed to be linearly polarized and can have an arbitrary location. Both the copolarized and the cross polarized reflector radiation patterns are computed. Calculations using the technique compare closely with measured radiation patterns of a waveguide-fed offset parabolic reflector. The unique features of this technique are the freedom from restrictive feed assumptions and the numerical methods used in preparing the aperture plane electric field data for integration. Analysis of the radiation patterns of reflector antennas J Kauffman W Croswell L Jowers Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 24, No. 1. (1976), pp. 53-65. 2008-04-02T09:07:28-00:00 1976 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 24 1 53 65 analysis antenna pattern radiation reflector http://www.citeulike.org/user/dcastro/article/2575374 <i>Electrical and Computer Engineering, 2002. IEEE CCECE 2002. Canadian Conference on, Vol. 1 (2002), pp. 342-346 vol.1.</i><br /><br />This work demonstrates the combination of NEC2, for electromagnetic computation, with Matlab, for composing input files and graphical display of the results. It presents Matlab-NEC2 automation as applied to adaptive array antenna synthesis and design. NEC2 (numerical electromagnetics code 2) is a popular program, with available source code, for numerical electromagnetic computations based on the moment method. NEC2 input is in the form of a text file with the data in 80-column format. The output is written to an ASCII text file, with headers followed by tables of values. Matlab is a very powerful matrix and math software package, with advanced file I/O and graphical display capabilities. Because the input file to NEC2 adheres to strict rules, the numerical data can be prepared in Matlab and then concatenated with the appropriate strings and written to a text file. Matlab can call the NEC2 executable from within one of its scripts (called m-files), and then read in the resulting NEC2 output file for further analysis. In essence, NEC2 becomes a solver driven by Matlab. Given an optimization strategy, Matlab can iterate the above-mentioned process, until convergence or another criterion is met. Automating NEC2 with Matlab/sup /spl reg// for antenna analysis and design J Dietrich A Sebak doi:10.1109/CCECE.2002.1015246 Electrical and Computer Engineering, 2002. IEEE CCECE 2002. Canadian Conference on, Vol. 1 (2002), pp. 342-346 vol.1. 2008-03-23T20:22:26-00:00 2002 Electrical and Computer Engineering, 2002. IEEE CCECE 2002. Canadian Conference on 1 342 346 vol.1 analysis antenna design matlab simulation http://www.citeulike.org/user/dcastro/article/2002763 <i>Vehicular Technology, IEEE Transactions on, Vol. 40, No. 4. (1991), pp. 686-693.</i><br /><br />The author presents pilot-symbol-assisted modulation (PSAM) on a solid analytical basis, a feature missing from previous work. Closed-form expressions are presented for the bit error rate (BER) in binary-phase-shift-keying (BPSK) and in quadrature-phase-shift-keying (QPSK), for a tight upper bound on the symbol error rate in 16 quadrature-amplitude-modulation (16-QAM), and for the optimized receiver coefficients. The error rates obtained are lower than for differential detection for any combination of signal-to-noise ratio (SNR) and Doppler spread, and the performance is within 1 dB of a perfect reference system under slow-fading conditions and within 3 dB when the Doppler spread is 5% of the symbol rate An analysis of pilot symbol assisted modulation for Rayleigh fading channels [mobile radio] JK Cavers Vehicular Technology, IEEE Transactions on, Vol. 40, No. 4. (1991), pp. 686-693. 2007-11-28T10:27:54-00:00 1991 Vehicular Technology, IEEE Transactions on 40 4 686 693 analysis channel estimation fading mobile modulation pilot radio rayleigh symbol wireless http://www.citeulike.org/user/dcastro/article/1942911 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 4, No. 4. (1956), pp. 246-252.</i><br /><br />An analysis of four-arm symmetrical networks such as a branched directional double stub coupler or the hybrid ring (rat race) is presented. The input wave is broken into an even and an odd mode and the vector amplitude out the various arms is computed from the sums or differences of the reflection or transmission coefficients for the two modes. A zero decibel directional coupler is described and its possible use as a duplexer is proposed. The design of multiple stub directional couplers for any degree of coupling is discussed. A method of computing the bandwidth of all these couplers is outlined, and the bandwidth curves, the power out the various arms with respect to frequency of the zero decibel coupler, are computed. A tabulation is made for six different 3 db couplers (even-power split) and their standing wave ratio, evenness of power split and isolation of the fourth arm as a function of frequency assuming perfect performance at the band center. A Method of Analysis of Symmetrical Four-Port Networks J Reed GJ Wheeler Microwave Theory and Techniques, IEEE Transactions on, Vol. 4, No. 4. (1956), pp. 246-252. 2007-11-20T10:55:18-00:00 1956 Microwave Theory and Techniques, IEEE Transactions on 4 4 246 252 analysis branch-line coupler ratrace http://www.citeulike.org/user/dcastro/article/1021897 <i>Computer Networks, 2006 International Symposium on (2006), pp. 11-16.</i><br /><br />The challenge for broadband fixed wireless access (BFWA) systems, which represent an attractive solution for broadband access in the last mile and for wireless backhauling applications in the "middle mile", lies in providing high data rates and quality of service (QoS). Such requirements mainly derive from the need to provide new bandwidth consuming multimedia services and applications, efficient handling of IP traffic, effective use of the limited radio spectrum and a greater backhaul capacity to support the increased number of users per cell site. IEEE 802.16 family of standards and its associated consortium WiMAX are gaining more and more interest in the telecommunication areas as broadband fixed wireless access solution with possible extension in nomadic and mobile area. Its main leverages are an efficient handling of IP traffic, the support of channel adaptivity and advanced QoS management. This paper aims at defining a new packet-based scheduling strategy for an IEEE 802.16 system supporting variable length MAC protocol data units (PDUs) and adaptive coding and modulation while fulfilling QoS requirements. A performance analysis of the proposed scheduler is presented and discussed in terms of packet transfer delay, MAC overhead and average throughput. Performance analysis of an efficient packet-based IEEE 802.16 MAC supporting adaptive modulation and coding M Settembre M Puleri S Garritano P Testa R Albanese M Mancini V Lo Curto Computer Networks, 2006 International Symposium on (2006), pp. 11-16. 2007-01-02T00:28:08-00:00 2006 Computer Networks, 2006 International Symposium on 11 16 80216 adaptive analysis coding modulation wimax http://www.citeulike.org/user/dcastro/article/983552 <i>Personal, Indoor and Mobile Radio Communications, 2005. PIMRC 2005. IEEE 16th International Symposium on, Vol. 2 (2005), pp. 900-904 Vol. 2.</i><br /><br />In this paper, the performance of a prototypical IEEE 802.16e network is analyzed via link and system simulations. The exponential effective SIR mapping (EESM) is used to map the instantaneous SINR of received signals to a service-specific packet erasure rate (PER), which is in turn used to assess the downlink and uplink network and user data throughput. A variety of data traffic models are considered, including web browsing (HTTP) and full buffer sessions, operating in flat-fading and frequency-selective multipath channels such as the ITU Pedestrian-B model. The downlink network performance of the prototypical IEEE 802.16e network is compared to a 3GPP UMTS high speed downlink packet access (HSDPA) system of similar physical dimensions. System simulation results for the prototypical IEEE 802.16e network considered show-when frequency-selective scheduling is not applied-that the IEEE 802.16e downlink has similar throughput performance as HSDPA for a 70/30 TDD DL/UL frame split but approximately 40%-50% higher spectral efficiency, although control channel overhead and uplink capacity limitation remain significant open issues for further study. IEEE 802.16e system performance: analysis and simulations F Wang A Ghosh R Love K Stewart R Ratasuk R Bachu Y Sun Q Zhao Personal, Indoor and Mobile Radio Communications, 2005. PIMRC 2005. IEEE 16th International Symposium on, Vol. 2 (2005), pp. 900-904 Vol. 2. 2006-12-07T16:35:48-00:00 2005 Personal, Indoor and Mobile Radio Communications, 2005. PIMRC 2005. IEEE 16th International Symposium on 2 900 904 Vol. 2 80216 analysis ofdm performance simulation wimax wireless http://www.citeulike.org/user/dcastro/article/1902887 <i>Aerospace Conference, 2005 IEEE (2005), pp. 1678-1683.</i><br /><br />NASA's long-term goals for the exploration of Mars include the use of rovers and sensors which intercommunicate through proximity wireless networks. Elements of the network have a short transmission range, low power requirements, low cost, and a relatively short-life span. The performance of any such wireless network depends fundamentally on the radio frequency (RF) environment. In wireless communication systems, communication engineers are generally concerned with two main radio channel issues: link budget and multipath. We have already reported results concerning the link budget at selected sites on Mars. These results were based on a 2.4 GHz proximity wireless network and simulated RF coverage patterns using high-resolution (11 m/pixel) DEMs of the Gusev Crater and Meridiani Planum regions. This paper presents our current research results regarding the multipath environment at the same selected sites on Mars. Our simulations compute the PDP between an access point and a node taking into account environmental parameters including terrain. With these PDPs, we are able to predict and analyze delay spread statistics which could be used in designing wireless network receivers for use on Mars' surface. Simulation and analysis of the multipath environment of Mars V Chukkala P De Leon Aerospace Conference, 2005 IEEE (2005), pp. 1678-1683. 2007-11-12T14:08:34-00:00 2005 Aerospace Conference, 2005 IEEE 1678 1683 analysis environment mars multipath simulation