Highly Directive Resonator Antennas based on Composite Right/Left-Handed (CRLH) Transmission Lines

Conference: INICA 2007 - International ITG-Conference on Antennas
03/28/2007 - 03/30/2007 at Munich, Germany

Proceedings: INICA 2007

Pages: 5Language: englishTyp: PDF

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Rennings, A.; Liebig, T.; Otto, S.; Wolff, I. (IMST GmbH, Carl-Friedrich-Gauß-Str. 2, D-47475 Kamp-Lintfort, Germany)
Caloz, C. (cole Polytechnique, 2500 ch. de Polytechnique, Montréal, H3T 1J4, Québec, Canada)

A composite right/left-handed (CRLH) series mode zeroth order resonator antenna (ZORA) and a CRLH halfwavelength 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 (η ZORA > 70%) than the CRLH HWA (η 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.