Sat, 26 Jul 2008 06:05:09 BST CiteULike: dcastro's d-crlh http://www.citeulike.org/user/dcastro/tag/d-crlh CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/1876666 <i>Journal of Zhejiang University - Science A, Vol. 7, No. 10. (23 October 2006), pp. 1777-1780.</i><br /><br />Abstract  A dual structure of composite right/left handed (CRLH) transmission line (TL) is analyzed in which an inductance L R is in parallel with a capacitance C L and a shunt capacitance C R is in series with an inductance L L. Both the distributed and lumped cases are considered. The dispersion diagram and transmission properties of the dual CRLH TL are given and compared with those of a standard CRLH TL. Contrary to the frequency response of a standard CRLH TL, a dual CRLH TL has a left-handed (negative phase shift) band at higher frequencies and a right-handed (positive phase shift) band at lower frequencies. A novel dual-band balun is presented as an application. Dual structure of composite right/left-handed transmission line Xin Hu Pu Zhang Sailing He doi:10.1631/jzus.2006.A1777 Journal of Zhejiang University - Science A, Vol. 7, No. 10. (23 October 2006), pp. 1777-1780. 2007-11-07T07:53:03-00:00 2006 Journal of Zhejiang University - Science A 7 10 1777 1780 d-crlh structure tl http://www.citeulike.org/user/dcastro/article/1876663 <i>Antenna Technology: Small and Smart Antennas Metamaterials and Applications, 2007. IWAT '07. International Workshop on (2007), pp. 105-108.</i><br /><br />A GaAs MMIC technology of the novel dual composite right/left-handed (D-CRLH) transmission line (TL) is presented. The D-CRLH is the dual of the conventional CRLH in the sense that it consists of an LC parallel-tank impedance and of an LC series-tank admittance. This topological duality results into dual properties. 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, a property that may be exploited in various kinds of component and antenna applications. The proposed D-CRLH prototype exhibits a DC to 2.9 GHz right-handed (RH) band and a 5.1 GHz to 6.9 GHz left-handed (LH) band. The results in this paper are obtained from full-wave analysis, and they will be followed next by experimental results Dual Composite Right/Left-Handed (D-CRLH) Transmission Line in GaAs MMIC Technology Wei Tong HV Nguyen Zhirun Hu C Caloz Antenna Technology: Small and Smart Antennas Metamaterials and Applications, 2007. IWAT '07. International Workshop on (2007), pp. 105-108. 2007-11-07T07:52:41-00:00 2007 Antenna Technology: Small and Smart Antennas Metamaterials and Applications, 2007. IWAT '07. International Workshop on 105 108 d-crlh http://www.citeulike.org/user/dcastro/article/1876661 <i>physica status solidi (b), Vol. 244, No. 4. (2007), pp. 1219-1226.</i><br /><br />The propagation and radiation properties of dual composite right/left-handed (D-CRLH) transmission line metamaterials are presented, and validated experimentally with a 1D microstrip prototype. In its fast-wave regime, this structure operates as a leaky-wave antenna capable of backfire-to-endfire radiation scanning with beam squinting smaller than that of conventional CRLH (C-CRLH) antennas. It is shown that this D-CRLH beam squinting can be further reduced by increasing the group velocity but that this can occur, close (and possibly beyond) to luminal velocities, only at the expense of losses produced by parasitic effects, a fundamental limitation which is demonstrated via the Bloch impedance concept. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) Dual composite right/left-handed (D-CRLH) leaky-wave antenna with low beam squinting and tunable group velocity Christophe Caloz Samer Abielmona Hoang Van Nguyen Andre Rennings doi:10.1002/pssb.200674510 physica status solidi (b), Vol. 244, No. 4. (2007), pp. 1219-1226. 2007-11-07T07:51:25-00:00 2007 physica status solidi (b) 244 4 1219 1226 antenna d-crlh leaky metamaterial http://www.citeulike.org/user/dcastro/article/1876656 <i>Applied Physics A: Materials Science & Processing, Vol. 87, No. 2. (14 May 2007), pp. 309-316.</i><br /><br />Abstract  Broadband conventional- and dual-composite right/left-handed (C/D-CRLH) transmission line metamaterials are presented. The extended transmission line theory for these structures is developed and the fundamental C-CRLH and D-CRLH properties are described comparatively in terms of dispersion/attenuation diagrams and Bloch/characteristic impedances with subsequent transmission characteristics. A D-CRLHstructure, implemented in microstrip technology, is demonstrated experimentally for the first time and shown to have potential for unique applications. As an illustration of such applications, a novel double-band coupled-line coupler constituted of one C-CRLH and one D-CRLH transmission line is demonstrated and explained by generalized coupled-mode theory. Novel broadband conventional- and dual-composite right/left-handed (C/D-CRLH) metamaterials: properties, implementation and double-band coupler application C Caloz HV Nguyen doi:10.1007/s00339-006-3839-y Applied Physics A: Materials Science & Processing, Vol. 87, No. 2. (14 May 2007), pp. 309-316. 2007-11-07T07:50:25-00:00 2007 Applied Physics A: Materials Science & Processing 87 2 309 316 broadband crlh d-crlh metamaterial http://www.citeulike.org/user/dcastro/article/1876652 <i>Microwave and Wireless Components Letters, IEEE, Vol. 16, No. 11. (2006), pp. 585-587.</i><br /><br />The novel concept of dual composite right/left-handed (D-CRLH) transmission line metamaterial is introduced. The D-CRLH is the "dual" of the conventional CRLH in the sense that it has a series parallel (instead of series) LC tank and a shunt series (instead of parallel) LC tank. This topological duality results in dual properties. The D-CRLH indeed exhibits its left-handed (LH) band at high frequencies and its right-handed (RH) band at low frequencies and is of stop-band nature, in opposition to the CRLH which is low-frequency-LH/high-frequency-RH and pass-band. The so-called balanced condition is still valid in the D-CRLH for broadband matching. However, phase origin is at dc and infinity instead, as at the LH-RH transition, and the gap between the RH and LH bands cannot be closed up in practical implementations. In contrast, the D-CRLH provides an unlimited LH bandwidth. This letter presents the homogeneous and LC-network transmission parameters and the fundamental dispersion/impedance properties of the D-CRLH Dual Composite Right/Left-Handed (D-CRLH) Transmission Line Metamaterial C Caloz Microwave and Wireless Components Letters, IEEE, Vol. 16, No. 11. (2006), pp. 585-587. 2007-11-07T07:49:44-00:00 2006 Microwave and Wireless Components Letters, IEEE 16 11 585 587 d-crlh metamaterial