Sat, 19 Jul 2008 03:00:04 BST CiteULike: dcastro's crlh http://www.citeulike.org/user/dcastro/tag/crlh CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/3015428 <i>Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on (2007), pp. 1-6.</i><br /><br />A GaAs MMIC technology of the novel compact left-handed bandpass filter consisting of one left-handed (LH) transmission line (TL) and one dual composite right/lefthanded (D-CRLH) TL is presented. The D-CRLH is the dual of the conventional CRLH in the sense that it consists of a LC parallel-tank impedance and of a LC series-tank admittance. In contrast to the conventional CRLH TL which has LH operation at low-frequency and RH one at high-frequency, the D-LH TL exhibits its LH band at high frequencies and its RH band at low frequencies. Thus, utilizing the high pass property of LH and low pass property of D-CRLH, a bandpass filter can be constructed. In this paper, this novel idea is realized by MMIC technology. The proposed filter exhibits a broad passband from 6.2 GHz to 20.8 GHz with a size of 1.43 mm². Compact Fully Integrated GaAs Left-Handed Bandpass Filter for Ultrawide Band Wireless Applications W Tong H Yang Z Hu H Zhang Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on (2007), pp. 1-6. 2008-07-17T19:56:34-00:00 2007 Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on 1 6 crlh filter lh metamaterial uwb wireless http://www.citeulike.org/user/dcastro/article/3015427 <i>Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2007 International Symposium on (2007), pp. 378-381.</i><br /><br />A novel narrow-band bandpass filter using metamaterials is proposed. The filter is composed of cascaded four metamaterial unit cells. We study the properties of the device theoretically and experimentally. The measured results are presented and compared with the results simulated by a high-frequency structure simulator. It is observed that the measured results are good agreement with the simulated results. The proposed filter has narrow bandwidth, low insertion loss, compact dimensions, easy fabrication, and low cost. Application of CRLH Transmission Lines in Microstrip Filter Li Jiusheng Du Tieying Li Jianrui doi:10.1109/MAPE.2007.4393627 Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2007 International Symposium on (2007), pp. 378-381. 2008-07-17T19:56:28-00:00 2007 Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2007 International Symposium on 378 381 crlh filter tl http://www.citeulike.org/user/dcastro/article/3015422 <i>Antennas and Propagation International Symposium, 2007 IEEE (2007), pp. 4957-4960.</i><br /><br />This work demonstrates how certain properties of Negative-Refractive-Index Transmission-Line (NRI-TL) metamaterials can be utilized to miniaturize conventional microwave devices used to feed antennas. Specifically in NRI-TLs <i>small</i> values of the loading elements lead to <i>large</i> phase shifts per-unit-length, thus facilitating miniaturization. Using this principle, a compact NRI-TL branch-line coupler (85% area reduction) is presented. Moreover, a filter is presented with a performance that is similar to a four-stage coupled-line filter that is twice as long. Finally, these building blocks are combined to synthesize a compact NRI-TL diplexer that can separate two closely spaced frequencies (1.95 GHz / 2.03 GHz) with a minimum of 20 dB isolation. Compact Negative-Refractive-Index Transmission-Line (NRI-TL) coupler, filter and diplexer R Islam GV Eleftheriades doi:10.1109/APS.2007.4396657 Antennas and Propagation International Symposium, 2007 IEEE (2007), pp. 4957-4960. 2008-07-17T19:56:13-00:00 2007 Antennas and Propagation International Symposium, 2007 IEEE 4957 4960 crlh diplexer http://www.citeulike.org/user/dcastro/article/3001397 <i>Physical Review Letters, Vol. 89, No. 18. (10 October 2002), 183901.</i> Left-Handed-Media Simulation and Transmission of EM Waves in Subwavelength Split-Ring-Resonator-Loaded Metallic Waveguides R Marqués J Martel F Mesa F Medina doi:10.1103/PhysRevLett.89.183901 Physical Review Letters, Vol. 89, No. 18. (10 October 2002), 183901. 2008-07-15T07:53:14-00:00 2002 Physical Review Letters 89 18 183901 American Physical Society crlh srr waveguide http://www.citeulike.org/user/dcastro/article/2941960 <i>Comptes Rendus Physique, Vol. 6, No. 6. ( 2005), pp. 683-692.</i><br /><br />We review the electromagnetic properties of artificial structures such as photonic band gap materials (Electromagnetic Band Gap at microwaves) and metamaterials with main emphasis on backward (left-handed) propagation media. We consider free space and guiding structures by showing how the interaction of the electromagnetic wave with periodic dielectric (PBGs) and double negative metallic structures (DNGs) yields a negative refractive index. Some of the potential applications in connection with negative index media are briefly discussed such as focusing for a flat lens and phase advance for a left handed transmission line. To cite this article: T. Decoopman et al., C. R. Physique 6 (2005). Left-handed propagation media via photonic crystal and metamaterials Thibaut Decoopman Thomas Crepin Mathias Perrin Sophie Fasquel Aurélien Marteau Xavier Mélique Eric Lheurette Olivier Vanbésien Didier Lippens doi:10.1016/j.crhy.2005.06.007 Comptes Rendus Physique, Vol. 6, No. 6. ( 2005), pp. 683-692. 2008-06-29T18:30:15-00:00 2005 Comptes Rendus Physique 6 6 683 692 crlh lh metamaterial pbg http://www.citeulike.org/user/dcastro/article/2941953 <i>Journal of Zhejiang University - Science A, Vol. 7, No. 1. (23 January 2006), pp. 34-40.</i><br /><br />Abstract  In this paper, numerical modelling of left-handed materials (LHMs) is presented using in-house and commercial software packages. Approaches used include the finite-difference time-domain (FDTD) method, finite element method (FEM) and method of moments (MoMs). Numerical simulation includes verification of negative refraction and “perfect lenses” construction, investigation of evanescent wave behaviour in layered LHMs, reversed Snell’s Law in electromagnetic band gap (EBG)-like structures and construction of LHMs using modified split ring resonators (SRRs). Numerical results were verified to be in good agreement with theory. At the end of this paper, potential applications of LHMs in microwave engineering are discussed. From electromagnetic bandgap to left-handed metamaterials: Modelling and applications Yang Hao doi:10.1631/jzus.2006.A0034 Journal of Zhejiang University - Science A, Vol. 7, No. 1. (23 January 2006), pp. 34-40. 2008-06-29T18:26:30-00:00 2006 Journal of Zhejiang University - Science A 7 1 34 40 crlh metamaterial pbg 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/2941928 <i>Journal of Applied Physics, Vol. 90, No. 11. (2001), pp. 5483-5486.</i><br /><br />View This Record in Scopus Full-wave verification of the fundamental properties of left-handed materials in waveguide configurations C Caloz CC Chang T Itoh Journal of Applied Physics, Vol. 90, No. 11. (2001), pp. 5483-5486. 2008-06-29T18:02:13-00:00 2001 Journal of Applied Physics 90 11 5483 5486 AIP crlh lh metamaterial http://www.citeulike.org/user/dcastro/article/2938417 <i>Metamaterials for Microwave and (Sub) Millimetre Wave Applications: Photonic Bandgap and Double Negative Designs, Components and Experiments, 2003. IEE Seminar on (2003), pp. 12/1-12/8.</i> Enabling rfimicrowave devices using negative refractive-index transmission-line metamaterials GV Eleftheriades A Grbic AK Iyer MA Antoniades R Islam Metamaterials for Microwave and (Sub) Millimetre Wave Applications: Photonic Bandgap and Double Negative Designs, Components and Experiments, 2003. IEE Seminar on (2003), pp. 12/1-12/8. 2008-06-27T23:48:42-00:00 2003 Metamaterials for Microwave and (Sub) Millimetre Wave Applications: Photonic Bandgap and Double Negative Designs, Components and Experiments, 2003. IEE Seminar on 12/1 12/8 crlh metamaterial microwave http://www.citeulike.org/user/dcastro/article/2920518 <i>Radio and Wireless Symposium, 2008 IEEE (2008), pp. 635-638.</i><br /><br />This paper presents a dynamic radiation pattern diversity (DRPD) MIMO wireless system where the antennas radiation patterns are electronically controlled in real-time. The adopted antenna elements are composite right/left-handed (CRLH) microstrip leaky-wave (LW) antennas for which the beam direction can be electronically scanned in a continuous manner from backfire to endfire and the beam shape can be controlled. This system offers a tremendous amount of flexibility in tuning the channel transfer matrix to increase the system performance. Based on this architecture, we propose two simple radiation pattern control algorithms. The first one requires no feedback and averages out the channel fades while the second one requires a simple feedback at the receiver to select the beam pattern maximizing the performance metric. The capacity of both algorithms is derived and analyzed using Monte Carlo simulations. The results show that these algorithms significantly improve the wireless link outage performance in a slow fading environment and increase the diversity gain of a MIMO system for a fixed multiplexing gain. Dynamic radiation pattern diversity (DRPD) MIMO using CRLH leaky-wave antennas JF Frigon C Caloz Yanyang Zhao doi:10.1109/RWS.2008.4463572 Radio and Wireless Symposium, 2008 IEEE (2008), pp. 635-638. 2008-06-24T07:20:03-00:00 2008 Radio and Wireless Symposium, 2008 IEEE 635 638 antenna crlh metamaterial mimo pattern radiation http://www.citeulike.org/user/dcastro/article/2920479 <i>Antennas and Propagation, IEEE Transactions on, Vol. 54, No. 8. (2006), pp. 2292-2300.</i><br /><br />A novel high-gain active composite right/left-handed (CRLH) metamaterial leaky-wave antenna (LWA) is presented. This antenna, which is designed to operate at broadside, is constituted by passive CRLH leaky-wave sections interconnected by amplifiers, which regenerate the power progressively leaked out of the structure in the radiation process in order to increase the effective aperture of the antenna and thereby its gain. The gain is further enhanced by a matching regeneration effect induced by the quasi-unilateral nature of the amplifiers. Both the cases of quasi-uniform and binomial field distributions, corresponding to maximum directivity and minimum side-lobe level, respectively, have been described. An active LWA prototype is demonstrated in transmission mode with a gain enhancement of 8.9 dB compared to its passive counterpart. The proposed antenna can attain an arbitrarily high gain by simple increase of the length of the structure, without penalty in terms of return loss and without requiring a complicated feeding network like conventional array antennas. High-gain active composite right/left-handed leaky-wave antenna FP Casares-Miranda C Camacho-Penalosa C Caloz doi:10.1109/TAP.2006.879210 Antennas and Propagation, IEEE Transactions on, Vol. 54, No. 8. (2006), pp. 2292-2300. 2008-06-24T07:03:54-00:00 2006 Antennas and Propagation, IEEE Transactions on 54 8 2292 2300 active antenna crlh gain metamaterial http://www.citeulike.org/user/dcastro/article/2896214 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 53, No. 9. (2005), pp. 2956-2967.</i><br /><br />Four properties related to left-handed metamaterials are studied numerically: transmission within a stop-band, backward phase, negative refraction, and partial focusing. The unit cell of the metamaterial under study is composed of a rod and a ring originally proposed at infrared frequencies and redesigned here at microwave frequencies. We show that this ring, because of its symmetry, exhibits a better transmission in a parallel-plate waveguide than the original concentric split-ring resonator. Negative refraction is studied from a prism-shaped metamaterial, while all of the other properties are studied from a slab-shaped metamaterial. In particular, transmission and backward phase are studied on a slab where rings naturally couple with the incident wave, while partial focusing is studied on a slab of rings perpendicular to the direction of propagation. The numerical simulations are based on a two-dimensional periodic method of moments, whose Green's function is computed via Ewald's method, and a three-dimensional finite-difference time-domain technique. Properties of left-handed metamaterials: transmission, backward phase, negative refraction, and focusing TM Grzegorczyk CD Moss Jie Lu Xudong Chen J Pacheco Jin Kong doi:10.1109/TMTT.2005.854261 Microwave Theory and Techniques, IEEE Transactions on, Vol. 53, No. 9. (2005), pp. 2956-2967. 2008-06-15T13:49:49-00:00 2005 Microwave Theory and Techniques, IEEE Transactions on 53 9 2956 2967 crlh metamaterial http://www.citeulike.org/user/dcastro/article/2890779 <i>Electrotechnical Conference, 2006. MELECON 2006. IEEE Mediterranean (2006), pp. 276-279.</i><br /><br />The use of composite right/left-handed transmission lines (CRLH-TLs) in distributed mixers, instead of the usual right-handed transmission lines (RH-TLs), is explored. A simplified analysis, based on lossless transmission lines and a simple model for the active devices, shows that innovative distributed mixer designs could be achieved. In particular, it is shown that it is possible to extract the IF output from different output ports, depending on the RF frequency. Active composite right/left-handed transmission line-based mixers J Mata-Contreras TM Martin-Guerrero C Camacho-Penalosa doi:10.1109/MELCON.2006.1653092 Electrotechnical Conference, 2006. MELECON 2006. IEEE Mediterranean (2006), pp. 276-279. 2008-06-13T08:39:41-00:00 2006 Electrotechnical Conference, 2006. MELECON 2006. IEEE Mediterranean 276 279 active crlh metamaterial mixer tl http://www.citeulike.org/user/dcastro/article/2883767 <i>Antennas and Propagation, IEEE Transactions on, Vol. 56, No. 3. (2008), pp. 675-683.</i><br /><br />A novel compact planar antenna utilizing cascaded right/left-handed transmission lines is proposed. The significance of layout planning with respect to radiation is investigated and discussed in this paper. Two segments of transmission lines of the same electrical length with opposite signs are cascaded to provide zero phase at the operation frequency. The closed-form formulas for the equivalent circuit of a transmission line are used for circuit design. Both antenna layout and radiation mechanism are discussed. For experimental demonstration, the proposed antenna operating at 2.45 GHz was implemented on an FR4 substrate. The topology using several patches has quite smaller size than the conventional patch antenna. Besides, a fairly omnidirectional radiation pattern was measured. A Compact Slot Antenna Utilizing a Right/Left-Handed Transmission Line Feed Yu-Shin Wang Min-Feng Hsu Shyh-Jong Chung doi:10.1109/TAP.2008.916910 Antennas and Propagation, IEEE Transactions on, Vol. 56, No. 3. (2008), pp. 675-683. 2008-06-11T20:27:11-00:00 2008 Antennas and Propagation, IEEE Transactions on 56 3 675 683 antenna crlh metamaterial tl http://www.citeulike.org/user/dcastro/article/2859756 <i>Antennas and Propagation, IEEE Transactions on, Vol. 55, No. 3. (2007), pp. 868-876.</i><br /><br />The analysis of resonant-type antennas based on the fundamental infinite wavelength supported by certain periodic structures is presented. Since the phase shift is zero for a unit-cell that supports an infinite wavelength, the physical size of the antenna can be arbitrary; the antenna's size is independent of the resonance phenomenon. The antenna's operational frequency depends only on its unit-cell and the antenna's physical size depends on the number of unit-cells. In particular, the unit-cell is based on the composite right/left-handed (CRLH) metamaterial transmission line (TL). It is shown that the CRLH TL is a general model for the required unit-cell, which includes a nonessential series capacitance for the generation of an infinite wavelength. The analysis and design of the required unit-cell is discussed based upon field distributions and dispersion diagrams. It is also shown that the supported infinite wavelength can be used to generate a monopolar radiation pattern. Infinite wavelength resonant antennas are realized with different number of unit-cells to demonstrate the infinite wavelength resonance Infinite Wavelength Resonant Antennas With Monopolar Radiation Pattern Based on Periodic Structures A Lai KMKH Leong T Itoh doi:10.1109/TAP.2007.891845 Antennas and Propagation, IEEE Transactions on, Vol. 55, No. 3. (2007), pp. 868-876. 2008-06-03T18:57:48-00:00 2007 Antennas and Propagation, IEEE Transactions on 55 3 868 876 antenna crlh metamaterial http://www.citeulike.org/user/dcastro/article/2839866 <i>Microwave Symposium Digest, 2005 IEEE MTT-S International (2005), 4 pp..</i><br /><br />A class-F power amplifier at 2.4GHz using a novel harmonic tuner based on a composite right/left handed (CRLH) transmission line (TL) is proposed and experimentally tested. Two structures are presented. One structure uses one open CRLH-TL stub to suppress 2nd, 3rd harmonics and the fundamental frequency is matched to 50/spl Omega/. The other structure uses two open CRLH-TL stubs in order to suppress 2nd, 3rd, 4th harmonics and the fundamental frequency is matched to specific impedance. The structure proposed is used to design a class-F power amplifier. A maximum drain efficiency of 64% is obtained. Class-F power amplifier using a multi-frequency composite right/left-handed transmission line harmonic tuner A Dupuy KMKH Leong T Itoh doi:10.1109/MWSYM.2005.1517142 Microwave Symposium Digest, 2005 IEEE MTT-S International (2005), 4 pp.. 2008-05-28T06:59:29-00:00 2005 Microwave Symposium Digest, 2005 IEEE MTT-S International 4 pp. amplifier crlh metamaterial power http://www.citeulike.org/user/dcastro/article/2839865 <i>Antennas and Propagation Society International Symposium, 2005 IEEE, Vol. 3A (2005), pp. 798-801 vol. 3A.</i><br /><br />An FDTD method, combined with thin wire and thin slot algorithms used to analyze a metamaterial based on periodic mushroom structures, is proposed. This proposed method is suitable for analyzing problems with fine structural details. Two examples of mushroom structures are investigated to compare the results between simulation and measurement to show left-handed propagation properties. Accuracy of the proposed method is verified compared to the measurement results. Efficient FDTD method for analysis of left-handed mushroom structure Wei-Yang Wu A Lai KMKH Leong Chih-Wen Kuo T Itoh doi:10.1109/APS.2005.1552377 Antennas and Propagation Society International Symposium, 2005 IEEE, Vol. 3A (2005), pp. 798-801 vol. 3A. 2008-05-28T06:58:07-00:00 2005 Antennas and Propagation Society International Symposium, 2005 IEEE 3A 798 801 vol. 3A crlh fdtd metamaterial mushroom http://www.citeulike.org/user/dcastro/article/2839850 <i>Microwave Conference, 2006. APMC 2006. Asia-Pacific (2006), pp. 1345-1348.</i><br /><br />A quasi-TEM approximation of the coupled mode theory generalized to conventional/CRLH-metamaterial contradirectional coupled-line couplers is presented and demonstrated experimentally. Coupled mode theory approximation for arbitrary conventional/metamaterial contradirectional coupled-line couplers HV Nguyen C Caloz doi:10.1109/APMC.2006.4429655 Microwave Conference, 2006. APMC 2006. Asia-Pacific (2006), pp. 1345-1348. 2008-05-28T06:43:50-00:00 2006 Microwave Conference, 2006. APMC 2006. Asia-Pacific 1345 1348 coupler crlh metamaterial http://www.citeulike.org/user/dcastro/article/2839848 <i>Antennas and Propagation Society International Symposium, 2005 IEEE, Vol. 2B (2005), pp. 218-221 vol. 2B.</i><br /><br />The paper presents the design of an electrically small antenna employing a composite right/left-handed (CRLH) transmission line. The physical size and operating frequency of the antenna depend on the unit cell size and equivalent transmission line model parameters. Therefore, the small antenna is realized by miniaturizing the unit cell and increasing the shunt inductance and series capacitance. A four unit cell resonant antenna is designed and tested at 1.06 GHz. The length, width and height of the proposed antenna are (1/19)/spl lambda//sub 0/, (1/23)/spl lambda//sub 0/, and (1/83)/spl lambda//sub 0/, respectively. Design of resonant small antenna using composite right/left-handed transmission line Cheng-Jung Lee KMKH Leong T Itoh Antennas and Propagation Society International Symposium, 2005 IEEE, Vol. 2B (2005), pp. 218-221 vol. 2B. 2008-05-28T06:43:43-00:00 2005 Antennas and Propagation Society International Symposium, 2005 IEEE 2B 218 221 vol. 2B antenna crlh resonant small tl http://www.citeulike.org/user/dcastro/article/2839828 <i>Antenna Technology Small Antennas and Novel Metamaterials, 2006 IEEE International Workshop on (2006), pp. 404-407.</i> Composite Right/Left-Handed Metamaterial Antennas A Lai KMKH Leong T Itoh Antenna Technology Small Antennas and Novel Metamaterials, 2006 IEEE International Workshop on (2006), pp. 404-407. 2008-05-28T06:41:50-00:00 2006 Antenna Technology Small Antennas and Novel Metamaterials, 2006 IEEE International Workshop on 404 407 antenna crlh metamaterial 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/2839826 <i>Microwave Symposium Digest, 2006. IEEE MTT-S International (2006), pp. 931-934.</i><br /><br />In this paper, dual-band bandpass and bandstop filters using composite right/left-handed (CRLH) metamaterial transmission lines (TLs) are developed. The conventional bandpass and bandstop filters are first designed using quarter-wave short-circuited and open-circuited stubs, respectively. Then the dual-band filters with arbitrary dual operating bands can then be easily implemented by replacing the microstrip lines with the CRLH TLs. The dual-band bandpass and bandstop filters using the CRLH TLs are experimentally demonstrated at dual operating frequencies 1 GHz and 1.9 GHz. The measured results are in a good agreement with the simulated results. From the measured performances, the dual-band bandpass filter has 29.8% and 17.3% pass bandwidths, while the dual-band bandstop filter has 12.2% and 6.9% stop bandwidths with 30dB attenuation Dual-Band Bandpass and Bandstop Filters Using Composite Right/Left-Handed Metamaterial Transmission Lines Chao-Hsiung Tseng Tatsuo Itoh doi:10.1109/MWSYM.2006.249869 Microwave Symposium Digest, 2006. IEEE MTT-S International (2006), pp. 931-934. 2008-05-28T06:41:46-00:00 2006 Microwave Symposium Digest, 2006. IEEE MTT-S International 931 934 crlh filter metamaterial http://www.citeulike.org/user/dcastro/article/2839824 <i>Microwave Symposium, 2007. IEEE/MTT-S International (2007), pp. 1823-1826.</i><br /><br />A new configuration of composite right/left handed (CRLH) metamaterial structure is proposed, which comprises of TE-resonant dielectric resonators and metallic parallel mesh plates. The balanced CRLH transmission lines are designed by adjusting the optimal distance between the mesh plates for a given size of the mesh windows. To confirm the fundamental operation, the transmission and far field radiation characteristics are simulated and measured for the one-dimensional structure. The numerical results show that the increase in the thickness of metallic mesh plates dramatically reduces the radiation efficiency. Nevertheless, the numerical simulation and measurement validate the continuous change in the phase flow along the waveguide from backward to forward directions with the operational frequency. Composite Right/Left Handed Metamaterial Structures Composed of Dielectric Resonators and Parallel Mesh Plates T Ueda N Michishita T Itoh doi:10.1109/MWSYM.2007.380104 Microwave Symposium, 2007. IEEE/MTT-S International (2007), pp. 1823-1826. 2008-05-28T06:41:40-00:00 2007 Microwave Symposium, 2007. IEEE/MTT-S International 1823 1826 crlh metamaterial resonator http://www.citeulike.org/user/dcastro/article/2839810 <i>Antenna Technology: Small Antennas and Novel Metamaterials, 2005. IWAT 2005. IEEE International Workshop on (2005), pp. 69-72.</i><br /><br />Recent research on metamaterials with simultaneously negative permittivity (/spl epsiv/) and permeability (/spl mu/), more commonly referred to as left-handed (LH) materials, has stimulated the development of novel concepts and applications. Since right-handed (RH) effects are unavoidable, practical LH materials (LHM) are in reality composite right/left-handed (CRLH) materials. Interestingly, the co-existence of LH and RH contributions in CRLH materials, far from being detrimental, leads to useful phenomena. By applying a transmission-line (TL) approach towards CRLH metamaterials, the unique properties of these metamaterials have been used to realize novel microwave devices including antennas with characteristics (functionalities or performance) surpassing those of conventional (i.e., RH) materials. Microwave devices based on composite right/left-handed (CRLH) transmission line metamaterials A Lai C Caloz T Itoh doi:10.1109/IWAT.2005.1461003 Antenna Technology: Small Antennas and Novel Metamaterials, 2005. IWAT 2005. IEEE International Workshop on (2005), pp. 69-72. 2008-05-28T06:41:03-00:00 2005 Antenna Technology: Small Antennas and Novel Metamaterials, 2005. IWAT 2005. IEEE International Workshop on 69 72 crlh metamaterial microwave tl http://www.citeulike.org/user/dcastro/article/2809085 <i>Microwave Conference, 2006. 36th European (2006), pp. 1048-1051.</i><br /><br />A meandered dipole with polarisation orthogonal to its length is presented. The dipole is made by loading a folded dipole in a way similar to a left handed transmission line. A prototype has been designed and constructed. Results confirm that good input matching and radiation pattern are achieved, although gain is low due to losses in the loading structure Orthogonally Polarised Dipole Antenna using Left Handed Transmission Lines H Iizuka PS Hall doi:10.1109/EUMC.2006.281113 Microwave Conference, 2006. 36th European (2006), pp. 1048-1051. 2008-05-18T14:13:31-00:00 2006 Microwave Conference, 2006. 36th European 1048 1051 antenna crlh dipole lh metamaterial tl http://www.citeulike.org/user/dcastro/article/2809071 <i>Antennas and Propagation Society International Symposium 2006, IEEE (2006), pp. 394-397.</i><br /><br />Application of left-handed (LH) metamaterials in the field of microwave engineering has grown rapidly following their experimental verification. In particular, the LH transmission line (TL) has been used to realize various microwave devices not possible with conventional TLs alone. The purpose of this paper is to summarize some of the recent advances in microwave devices based on LH TLs. In particular, devices based on the unique characteristics of the composite right/left-handed (CRLH) TL, which is the general model of a practical LH TL, are presented. Microwave devices based on left-handed transmission lines A Lai KMKH Leong T Itoh doi:10.1109/APS.2006.1710541 Antennas and Propagation Society International Symposium 2006, IEEE (2006), pp. 394-397. 2008-05-18T14:06:55-00:00 2006 Antennas and Propagation Society International Symposium 2006, IEEE 394 397 crlh lh metamaterial microwave tl http://www.citeulike.org/user/dcastro/article/2809066 <i>Antennas and Wireless Propagation Letters, IEEE, Vol. 6 (2007), pp. 186-190.</i><br /><br />In this letter, we consider resonant patch antennas, implemented using loaded transmission-line networks and other exotic structures having engineered dispersion. An analytical expression is derived for the ratio of radiation quality factors of such antennas and conventional patch antennas loaded with (reference) dielectrics. In the ideal case this ratio depends only on the propagation constant and wave impedance of the structure under test, and it can be conveniently used to study what kind of dispersion leads to improved impedance bandwidth. We illustrate the effect of dispersion by implementing a resonant patch antenna using a periodic network of lumped reactive (LC) elements. The analytical results predicting enhanced impedance bandwidth compared to the reference results are validated using a commercial circuit simulator. Discussion is conducted on the practical limitations for the use of the proposed expression On Impedance Bandwidth of Resonant Patch Antennas Implemented Using Structures With Engineered Dispersion PMT Ikonen P Alitalo SA Tretyakov doi:10.1109/LAWP.2007.895920 Antennas and Wireless Propagation Letters, IEEE, Vol. 6 (2007), pp. 186-190. 2008-05-18T14:05:13-00:00 2007 Antennas and Wireless Propagation Letters, IEEE 6 186 190 antenna bandwidth crlh impedance metamaterial patch http://www.citeulike.org/user/dcastro/article/2808917 <i>PROCEEDINGS OF ISAP2005 (2005)</i> A Novel Design of Balun using Left-Handed Transmission Line Seungjun Lee Jong-Sik Lim Hoe-Sung Yang Sangwook Nam PROCEEDINGS OF ISAP2005 (2005) 2008-05-18T12:24:35-00:00 2005 PROCEEDINGS OF ISAP2005 balun crlh metamaterial tl http://www.citeulike.org/user/dcastro/article/2808883 <i>URSI (2005)</i> WBIDC: Nuevo condensador interdigital de banda ancha Francisco Pablo Roth Enrique Segura Carlos Peñalosa URSI (2005) 2008-05-18T11:59:41-00:00 2005 URSI capacitor crlh wideband http://www.citeulike.org/user/dcastro/article/2805159 <i>Microwave Conference, 2005 European, Vol. 1 (2005), 4 pp..</i><br /><br />This paper reports on the design of a novel LC balun based on a replacement circuit of right-handed (RH) and left-handed transmission lines in combination. This approach gives a very simple balun structure with excellent broadband performance. The balun is designed for WLAN applications in the 5 GHz ISM band. Concept of the balun, simulation, realisation and measurement results are presented. A simple LTCC balun for WLAN applications using left-handed (LH) transmission lines (TL) K Markov S Royak G Sevskiy P Heide doi:10.1109/EUMC.2005.1608813 Microwave Conference, 2005 European, Vol. 1 (2005), 4 pp.. 2008-05-16T12:02:17-00:00 2005 Microwave Conference, 2005 European 1 4 pp. balun crlh lh metamaterial tl wlan http://www.citeulike.org/user/dcastro/article/2768683 <i>Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on (2007), pp. 1-6.</i><br /><br />In this paper we propose the use of Composite Right/Left Hand (CRLH) transmission lines in ring antennas. This type of antenna presents advantages over conventional patches such as larger gain or radiation and efficiency and what it is more, the fact that the fundamental mode is the zero one. A CRLH transmission line consists of a conventional transmission line, or a Right-Handed transmission line, and its dual part consisting of series capacitors (CL) and shunt inductors (LL), termed a Left- Handed transmission line. The unique properties of this structure have been employed in several applications using CRLH transmission line consisting of a microstrip line (RH) and lumped elements section (LH) or distributed CRLH transmission lines. Specifically the non-linear phase response of a CRLH transmission line has been utilized to design arbitrary dual-band components. New Radiating Structures based on Applying CRLH Concepts in Short-Circuited Rings D Castro D Segovia-Vargas V Gonzalez-Posadas Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on (2007), pp. 1-6. 2008-05-08T06:49:18-00:00 2007 Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on 1 6 crlh rings shorted http://www.citeulike.org/user/dcastro/article/2768678 <i>Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on (2007), pp. 1-6.</i><br /><br />Microstrip patches filled with Left-Handed Structures are proposed to obtain dual band circularly polarized antennas. The proposed antennas have two modes at different frequencies with similar characteristics to the fundamental mode of a conventional patch. These modes are excited in two orthogonal directions with a 90° phase shift to obtain dual band circularly polarized antennas. The most important feature of the proposed antennas is that the frequency ratio between the working frequencies can be set within a large range: from values smaller than 1.2 to values larger than 2.2. Finally, a dual band circularly polarized antenna for GSM 1800 and WCDMA is designed, manufactured and measured. The working ratio is only 1.17, which cannot be obtained with other approaches. A Dual Band Circularly Polarized Antenna based on a Microstrip Patch Filled with Left-Handed Structures FJ Herraiz-Martinez V Gonzalez-Posadas D Segovia-Vargas Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on (2007), pp. 1-6. 2008-05-08T06:48:06-00:00 2007 Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on 1 6 antenna circularly crlh dual-band microstrip patch polarisation http://www.citeulike.org/user/dcastro/article/2674629 <i>Antennas and Propagation Society International Symposium, 2005 IEEE, Vol. 1A (2005), pp. 684-687 Vol. 1A.</i><br /><br />A novel ring structure operating as a dual-frequency resonating antenna is presented. The ring analysis and design is based on the concept of the composite right/left-handed transmission line (CRLH TL), with the particularity that the ends of the line are connected together so as to form a closed loop. As in the case of conventional ring resonators, multiples of full wavelength (n/spl lambda/) field distributions are supported. The key feature of the proposed resonator is that an identical field distribution along the ring is achieved at two different operating frequencies. This phenomenon is due to the dual nature of the CRLH dispersion characteristic. The lower operating frequency corresponds to the /spl lambda/ mode in the left-handed (LH, backward wave, /spl beta/<0) range, while the higher resonance frequency corresponds to the /spl lambda/ mode in the right-handed (RH, forward wave, /spl beta/>0) range. The main benefit of having the same field distribution is that identical performances (radiation, polarization and matching) are achieved at each of the two frequencies. The proposed antenna structure has been simulated with commercial MoM/FEM tools and validated with measurements on fabricated prototypes. Composite right/left-handed /spl lambda/-resonator ring antenna for dual-frequency operation S Otto A Rennings C Caloz P Waldow T Itoh Antennas and Propagation Society International Symposium, 2005 IEEE, Vol. 1A (2005), pp. 684-687 Vol. 1A. 2008-04-15T18:02:19-00:00 2005 Antennas and Propagation Society International Symposium, 2005 IEEE 1A 684 687 Vol. 1A antenna crlh dual-band frequency ring http://www.citeulike.org/user/dcastro/article/2185964 <i>Microwave Conference, 2005 European, Vol. 1 (2005), 4 pp..</i><br /><br />A diplexer based on composite right/left handed (CRLH) transmission lines (TL) is presented in this paper. These TLs have been studied, described and applied in (Okabe et al., 2004), (I-Hsiang Lin et al., 2004) and (Caloz et al., 2004). A simultaneous control of the phase at two different frequencies has been done by using the properties of the CRLH TLs. A diplexer at 950 MHz and 1.8 GHz has been built using this technology. Novel diplexer based on CRLH transmission lines Novel diplexer based on CRLH transmission lines D Castro-Galan V Gonzalez-Posadas C Martin-Pascual doi:10.1109/EUMC.2005.1608811 Microwave Conference, 2005 European, Vol. 1 (2005), 4 pp.. 2008-01-01T19:26:23-00:00 2005 Microwave Conference, 2005 European 1 4 pp. crlh diplexer tesis tl http://www.citeulike.org/user/dcastro/article/2177292 <i>Microwave and Wireless Components Letters, IEEE, Vol. 17, No. 1. (2007), pp. 13-15.</i><br /><br />A novel method to obtain the dispersion diagram of a composite right/left-handed (CRLH) unit-cell is presented. This method is based on CRLH transmission-line (TL) theory and on the structure eigenfrequencies. First, it is shown that computing the dispersion diagram of an M unit cell CRLH TL only needs three eigenfrequencies. Then, it is shown that this method drastically reduces the total computation time to obtain the CRLH unit cell dispersion diagram (from several hours to a few minutes). A four cell resonator has been designed and built to show the accuracy of the proposed method. Good agreement between the measured prototype and resonant frequencies provided by the dispersion diagram obtained with the eigenfrequency method has been achieved Low-Cost Approach Based on an Eigenfrequency Method to Obtain the Dispersion Diagram in CRLH Structures FJ Herraiz-Martinez V Gonzalez-Posadas F Inigo-Villacorta D Segovia-Vargas Microwave and Wireless Components Letters, IEEE, Vol. 17, No. 1. (2007), pp. 13-15. 2007-12-28T13:09:48-00:00 2007 Microwave and Wireless Components Letters, IEEE 17 1 13 15 crlh http://www.citeulike.org/user/dcastro/article/2075639 <i>Antennas, 2007. INICA '07. 2nd International ITG Conference on (2007), pp. 190-194.</i><br /><br />A composite right/left-handed (CRLH) series mode zeroth order resonator antenna (ZORA) and a CRLH half-wavelength antenna (HWA) with tunable directivity are presented and demonstrated to exhibit substantially higher directivity than a conventional patch antenna in the case of a 2.4 GHz (WLAN) design. Due to the special dispersion relation of a CRLH transmission line (TL), the length of CRLH TL resonators can be enlarged while keeping their resonance frequency constant, which yields enhanced directivity. The ZORA has been shown to have a higher efficiency (¿ZORA &#x226B; 70%) than the CRLH HWA (¿HWA ¿ 40%), comparable to that of a patch antenna, as a result of the perfectly uniform current distribution in the zeroth order mode. In particular, the ZORA due to its versatile characteristics and high performance, is expected to find wide applications in the future. Highly Directive Resonator Antennas based on Composite Right/Left-Handed (CRLH) Transmission Lines A Rennings T Liebig S Otto C Caloz I Wolff Antennas, 2007. INICA '07. 2nd International ITG Conference on (2007), pp. 190-194. 2007-12-08T00:54:14-00:00 2007 Antennas, 2007. INICA '07. 2nd International ITG Conference on 190 194 antenna crlh tl http://www.citeulike.org/user/dcastro/article/1992074 <i>Microwave and Wireless Components Letters, IEEE, Vol. 14, No. 1. (2004), pp. 31-33.</i><br /><br />A novel backward directional coupler, composed of a conventional microstrip (C/spl mu/S) line and composite right/left-handed (CRLH) line, is proposed. This coupler is functionally backward but it is based on a forward-type coupling phenomenon. The coupler is shown to exhibit broad bandwidth and tight coupling characteristics. The theoretical circuit-model results are supported by full-wave and experimental evidence. A quasi 0-dB prototype with more than 50% bandwidth is demonstrated. A novel mixed conventional microstrip and composite right/left-handed backward-wave directional coupler with broadband and tight coupling characteristics C Caloz T Itoh Microwave and Wireless Components Letters, IEEE, Vol. 14, No. 1. (2004), pp. 31-33. 2007-11-27T10:19:02-00:00 2004 Microwave and Wireless Components Letters, IEEE 14 1 31 33 broadband coupler crlh directional microstrip http://www.citeulike.org/user/dcastro/article/1992073 <i>Microwave Symposium Digest, 2004 IEEE MTT-S International, Vol. 1 (2004), pp. 301-304 Vol.1.</i><br /><br />A via-free microstrip left-handed (LH) transmission line (TL) is proposed, which enables easy and low-cost fabrication of backward wave TLs. Based on the equivalent circuit, dispersion characteristics of the TL are theoretically obtained and the effect of the virtual short capacitance on the LH bandwidth is shown. The balanced/unbalanced CRLH criterion for seamless transition from the backward and forward wave propagation is also derived. The microstrip LH TL is implemented and the backward wave support is confirmed both by full-wave FEM simulations and experiments. A 38-cell TL exhibits a backward to forward scanning leaky-wave antenna capability. A via-free microstrip left-handed transmission line A Sanada K Murakami S Aso H Kubo I Awai Microwave Symposium Digest, 2004 IEEE MTT-S International, Vol. 1 (2004), pp. 301-304 Vol.1. 2007-11-27T10:18:44-00:00 2004 Microwave Symposium Digest, 2004 IEEE MTT-S International 1 301 304 Vol.1 crlh lh microstrip tl http://www.citeulike.org/user/dcastro/article/1992063 <i>Antennas and Propagation, IEEE Transactions on, Vol. 52, No. 5. (2004), pp. 1159-1166.</i><br /><br />A transmission line (TL) approach of left-handed (LH) materials is proposed. The transmission characteristics of an ideal LH-TL are presented, the constitutive parameters of an equivalent LH material are derived and shown to be negative, and some LH-transmission paradoxes are explained. Next, a method to design an artificial LH-TL in the form of an ideal lumped-elements ladder network is described and illustrated with simulation results. It is shown that, in this line, left-handedness can be achieved without losses over an unlimited bandwidth, from the cutoff of the resulting high-pass filter to infinity, with excellent agreement with theory. Finally, a microstrip implementation of the LH line for microwaves, using interdigital capacitors and stub inductors, is demonstrated, with moderate insertion loss and a broad bandwidth of the order of 100%. Transmission line approach of left-handed (LH) materials and microstrip implementation of an artificial LH transmission line C Caloz T Itoh Antennas and Propagation, IEEE Transactions on, Vol. 52, No. 5. (2004), pp. 1159-1166. 2007-11-27T10:16:41-00:00 2004 Antennas and Propagation, IEEE Transactions on 52 5 1159 1166 crlh lh metamaterial microstrip tl http://www.citeulike.org/user/dcastro/article/1988310 <i>Applied Superconductivity, IEEE Transactions on, Vol. 15, No. 2. (2005), pp. 996-999.</i><br /><br />In this paper, for the first time, we study the properties of a superconductive-based left-handed transmission line (SLHTL). The effect of the kinetic inductance on the propagation constant of the left-handed transmission line is analyzed. It is shown that increasing the kinetic inductance decreases both the bragg frequency and the negative index frequency band of a distributed LHTL. A Coplanar waveguide structure is proposed to realize the LHTL. It is shown that the CPW structure has the capability of increasing the kinetic inductance of the TL by narrowing the spacing between the line and the ground plane because they are deposited on the same side of the substrate. This was not possible in a microstrip line as the spacing between the line and the ground is equal to the substrate thickness and is usually fixed. Furthermore, the dependency of the kinetic inductance to the bias current has been employed to design a tunable SLHTL. Possible applications of the tunable SLHTL in the design of miniaturized tunable resonators and filters are discussed. Analysis and design of Superconducting left-handed transmission lines H Salehi AH Majedi RR Mansour Applied Superconductivity, IEEE Transactions on, Vol. 15, No. 2. (2005), pp. 996-999. 2007-11-26T20:30:26-00:00 2005 Applied Superconductivity, IEEE Transactions on 15 2 996 999 crlh lh tl http://www.citeulike.org/user/dcastro/article/1988297 <i>Microwave Symposium Digest, 2003 IEEE MTT-S International, Vol. 1 (2003), pp. 317-320 vol.1.</i><br /><br />A novel broadband left-handed (LH) coupled-line backward coupler with arbitrary coupling level is presented. This coupler is composed of two LH transmission lines (TL) constituted of series interdigital capacitors and shunt shorted-stub inductors. A quasi-0dB implementation of the coupler is demonstrated by simulation and measurement results, and shown to exhibit a bandwidth of 35% despite the relatively wide lines-gap of 0.3mm. An even/odd modes analysis is presented to explain the working principle of the component. A 3dB-quadrature implementation, with 37% bandwidth, is also demonstrated. Finally, parametric results illustrate the versatility of the LH coupler and its strongly enhanced backward coupling compared with the conventional coupled-line coupler. A broadband left-handed (LH) coupled-line backward coupler with arbitrary coupling level C Caloz A Sanada L Liu T Itoh Microwave Symposium Digest, 2003 IEEE MTT-S International, Vol. 1 (2003), pp. 317-320 vol.1. 2007-11-26T20:28:44-00:00 2003 Microwave Symposium Digest, 2003 IEEE MTT-S International 1 317 320 vol.1 broadband coupler crlh lh metamaterial http://www.citeulike.org/user/dcastro/article/1023013 <i>Journal of Electromagnetic Waves and Applications, Vol. 20, No. 15. (2006), pp. 2137-2151.</i> Review of Electromagnetic Theory in Left-handed Materials Chen Wu Kong doi:10.1163/156939306779322585 Journal of Electromagnetic Waves and Applications, Vol. 20, No. 15. (2006), pp. 2137-2151. 2007-01-03T08:37:21-00:00 2006 Journal of Electromagnetic Waves and Applications 0920-5071 20 15 2137 2151 VSP crlh metamaterial review thesis http://www.citeulike.org/user/dcastro/article/1967474 <i>Electronics Letters, Vol. 43, No. 9. (2007), pp. 530-532.</i><br /><br />Microstrip lines periodically loaded with broad-side coupled spiral resonators (BC-SRs) are designed, fabricated and characterised for the first time. These structures inhibit signal propagation in the vicinity of the resonance frequency of the spirals, f_o. This stopband behaviour is due to magnetic coupling between the line and the BC-SRs at resonance. As long as the electrical size of the BC-SRs is small, the structures can also be considered as metamaterial transmission lines with negative effective permeability, mu_eff. This negative value of mu_eff takes place in a narrow band above f_o, as occurs in split ring resonator (SRR) loaded lines, or in transmission lines coupled to spiral resonators etched in a single metal level (edge-coupled spiral resonators (EC-SRs). However, because each loop of the BC-SR is etched in a different metal level (face-to-face loops), the equivalent capacitance of the resonant tank can be substantially enhanced. Thus, by using narrow microwave substrates, the BC-SRs loaded lines can be made much smaller than SRR or EC-SR loaded lines Metamaterial transmission lines based on broad-side coupled spiral resonators F Aznar M Gil J Bonache J Garcia-Garcia F Martin Electronics Letters, Vol. 43, No. 9. (2007), pp. 530-532. 2007-11-23T16:52:14-00:00 2007 Electronics Letters 43 9 530 532 crlh metamaterial resonator tl transmission http://www.citeulike.org/user/dcastro/article/1915065 <i>Antenna Technology Small Antennas and Novel Metamaterials, 2006 IEEE International Workshop on (2006), pp. 396-399.</i> A Left-Handed Dipole Concept H Iizuka PS Hall Antenna Technology Small Antennas and Novel Metamaterials, 2006 IEEE International Workshop on (2006), pp. 396-399. 2007-11-14T17:49:19-00:00 2006 Antenna Technology Small Antennas and Novel Metamaterials, 2006 IEEE International Workshop on 396 399 antenna crlh dipole metamaterial http://www.citeulike.org/user/dcastro/article/1915059 <i>Microwave and Optical Technology Letters, Vol. 48, No. 3. (2006), pp. 609-613.</i><br /><br />The use of so-called ?composite left/right-handed transmission lines? in the design of distributed amplifiers is discussed using a simple model for the active device. The simplified analysis performed herein shows that it is possible to modify the frequency response of forward and reverse power gains, a significant development which could lead to innovative distributed amplifier designs. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 609-613, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21422 Distributed amplifiers with composite left/right-handed transmission lines J Mata-Contreras TM Martín-Guerrero C Camacho-Peñalosa doi:10.1002/mop.21422 Microwave and Optical Technology Letters, Vol. 48, No. 3. (2006), pp. 609-613. 2007-11-14T17:48:40-00:00 2006 Microwave and Optical Technology Letters 48 3 609 613 amplifier crlh distributed tl http://www.citeulike.org/user/dcastro/article/1688758 <i>Physical Review B, Vol. 65, No. 3. (7 December 2001), 033401.</i><br /><br />Left-handed materials are studied numerically using an improved version of the transfer-matrix method. The transmission; reflection; phase of reflection; and absorption are calculated and compared with experiments for both single split-ring resonators with negative permeability and left-handed materials; which have both the permittivity ε and permeability μ negative. Our results suggest ways of positively identifying materials that have both ε and μ negative; from materials that have either μ or ε negative. Transmission studies of left-handed materials P Markoš CM Soukoulis doi:10.1103/PhysRevB.65.033401 Physical Review B, Vol. 65, No. 3. (7 December 2001), 033401. 2007-09-24T08:04:43-00:00 2001 Physical Review B 65 3 033401 American Physical Society crlh metamaterial transmission http://www.citeulike.org/user/dcastro/article/1880294 <i>Microwave and Wireless Components Letters, IEEE, Vol. 14, No. 6. (2004), pp. 274-276.</i><br /><br />An array factor approach of leaky-wave (LW) antennas is proposed for efficient and fast computation of the radiation patterns of complex metamaterial LW structures of arbitrary length from the analysis of a single periodic unit cell. This approach is demonstrated in one-dimensional and two-dimensional composite right/left-handed (CRLH) LW antennas. Array factor approach of leaky-wave antennas and application to 1-D/2-D composite right/left-handed (CRLH) structures C Caloz T Itoh Microwave and Wireless Components Letters, IEEE, Vol. 14, No. 6. (2004), pp. 274-276. 2007-11-07T18:40:37-00:00 2004 Microwave and Wireless Components Letters, IEEE 14 6 274 276 antenna array crlh leaky structures http://www.citeulike.org/user/dcastro/article/1880289 <i>Antennas and Propagation, IEEE Transactions on, Vol. 54, No. 4. (2006), pp. 1084-1091.</i><br /><br />This study investigates in detail the left-handed (LH) properties of the two-layer microstrip line, periodically loaded with broadside-coupled split ring resonators (BC-SRRs) and vias. The mechanism of the left-handed microstrip line (LHML), which includes the diamagnetic response, the backward-wave propagation and the proportionality of the guided wavelength on frequency, is discussed in terms of the field and current distributions and the dispersion diagram. To examine the resonance of the BC-SRR, both the full-wave eigenmode analysis and the closed-form formula based on the quasistatic approach are developed. The effects of the BC-SRR shape on the resonant frequency are evaluated. To facilitate the computer-aided-design (CAD) applications of the LHML, the equivalent-circuit model, which comprises the three-conductor coupled microstrip line for the coupling section, the series LC for the BC-SRR, and the shunt inductance for the via, is established. Good agreement among the results of the full-wave simulation, equivalent-circuit model, published data, and measurement supports the usefulness of the proposed modeling methodology and also validates the analytical expressions. The application of the LHML in the microstrip rectangular loop antenna fed by the conductor-backed coplanar waveguide-to-conductor-backed coplanar stripline (CBCPW-to-CBCPS) transition is presented to highlight the unique features of the LHML. Compared with the conventional loop antenna, the LHML-loaded loop antenna achieves a 50% area reduction and the 52% of main beam steering. Characterization and modeling of left-handed microstrip lines with application to loop antennas Shau-Gang Mao Shiou-Li Chen Antennas and Propagation, IEEE Transactions on, Vol. 54, No. 4. (2006), pp. 1084-1091. 2007-11-07T18:39:29-00:00 2006 Antennas and Propagation, IEEE Transactions on 54 4 1084 1091 antenna crlh metamaterial microstrip http://www.citeulike.org/user/dcastro/article/1880288 <i>Microwave and Wireless Components Letters, IEEE, Vol. 16, No. 11. (2006), pp. 624-626.</i><br /><br />An enhanced composite right/left-handed (CRLH) transmission line (TL) is presented in this letter. This TL, designed in microstrip technology, is implemented by means of a new improved interdigital capacitor (IDC), the so-called wire bonded IDC (WBIDC). The use of the WBIDC broadens the frequency band where the CRLH TL can be considered as a TL. A conventional 70-Omega CRLH TL (using IDCs) has been compared, by full-wave simulation and measurements, with its enhanced counterpart (using WBIDCs). In addition, this enhanced CRLH TL has been used to design a CRLH diplexer which presents several advantages over standard CRLH coupled lines (using IDCs). The diplexer response has been verified by means of a full-wave electromagnetic solver Composite Right/Left-Handed Transmission Line With Wire Bonded Interdigital Capacitor FP Casares-Miranda E Marquez-Segura P Otero C Camacho-Penalosa Microwave and Wireless Components Letters, IEEE, Vol. 16, No. 11. (2006), pp. 624-626. 2007-11-07T18:39:01-00:00 2006 Microwave and Wireless Components Letters, IEEE 16 11 624 626 capacitor crlh interdigital tl http://www.citeulike.org/user/dcastro/article/1880279 <i>Antennas and Propagation Society International Symposium, 2004. IEEE, Vol. 3 (2004), pp. 3413-3416 Vol.3.</i><br /><br />Based on the advance phase shift characteristics of left-handed transmission line, a millimeter wave microstrip array with composite right/left-handed transmission line as feeding line has been presented here. By means of CRLH-TL, insertion phase shift of the patch in the series configuration has been removed and higher gain of the array can be achieved. Millimeter wave microstrip array design with CRLH-TL as feeding line Zhu Qi Zhang Zhongxiang Xu Shanjia Ding Wenwu Antennas and Propagation Society International Symposium, 2004. IEEE, Vol. 3 (2004), pp. 3413-3416 Vol.3. 2007-11-07T18:36:48-00:00 2004 Antennas and Propagation Society International Symposium, 2004. IEEE 3 3413 3416 Vol.3 array crlh design microstrip tl