Summary
International Symposium on Antennas and Propagation
2010
Session Number:2WA2
Session:
Number:2WA2-2
Circularly Polarized Microstrip Leaky Wave Antenna using Composite Right/Left-Handed Transmission Line
Yoshiki Mitsuhata, Ryo Osagawa, Kazuhiro Kitatani, Yasuyuki Okamura,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Recently, researches for antennas with metamaterials have been studied actively [1-2]. A leaky wave antenna using a composite right/left handed (CRLH) concept has been investigated in particular. The CRLH leaky wave antennas with microstrip line [3-5] or rectangular waveguide [6] have been reported. The size of this type of antenna is smaller than that of the conventional antenna. In addition to this feature, this antenna can steer a beam direction from the backfire to the end-fire continuously by using peculiar characteristics in the CRLH region. The CRLH leaky wave antennas reported so far are mainly concerned with a linearly polarized operating; on the other hand, reports on circularly polarized antennas are very few. The circularly polarized antennas proposed so far employ mainly a phase shifter [7-8] to combine linearly polarized waves. The circularly polarized antenna is attractive in the deteriorated environment of the radio wave communications, and is useful for the sensor, radar, and mobile telecommunications as well. In this paper, we propose a circularly polarized microstrip leaky wave antenna using a composite right/left-handed transmission line without a phase shifter. The specific characteristics of the circularly polarized wave have been confirmed by the simulation and the experiment. First, we refer to the structure and the operation of the proposed antenna. Secondly, we show the simulated results on the generation of the circularly polarized waves and its possible wide steering. Finally, we exhibit the experimental results in detail.