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Dual composite right/left‐handed (D‐CRLH) leaky‐wave antenna with low beam squinting and tunable group velocity
Author(s) -
Caloz Christophe,
Abielmona Samer,
Van Nguyen Hoang,
Rennings Andre
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200674510
Subject(s) - leaky wave antenna , metamaterial , antenna (radio) , physics , left handed , transmission line , group velocity , metamaterial antenna , optics , microstrip , electrical impedance , composite number , beam (structure) , radiation , characteristic impedance , radiation pattern , acoustics , microstrip antenna , materials science , engineering , telecommunications , slot antenna , quantum mechanics , composite material
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)