Pseudo-Traveling-Wave Resonator With Magnetically Tunable Phase Gradient of Fields and Its Applications to Beam-Steering Antennas

被引：51

作者：

Ueda, Tetsuya ^{[1
]}

Yamamoto, Shintaro ^{[1
]}

Kado, Yuichi ^{[1
]}

Itoh, Tatsuo ^{[2
]}

机构：

[1] Kyoto Inst Technol, Dept Elect, Kyoto 6068585, Japan

[2] Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2012年 / 60卷 / 10期

基金：

日本学术振兴会;

关键词：

Beam steering; ferrite devices; leaky-wave antennas; metamaterials; periodic structures; HANDED TRANSMISSION-LINES; LEAKY-WAVE; MICROSTRIP LINES; RADIATION;

D O I：

10.1109/TMTT.2012.2207737

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A pseudo-traveling-wave resonator with magnetically tunable phase gradient of field distribution is investigated, and a new type of beam-steering antenna based on the resonator is experimentally demonstrated for the first time. It is a short-ended transmission-line resonator and is composed of a nonreciprocal phase-shift composite right/left-handed transmission line using a polycrystalline yttrium-iron-garnet rod. The resonator operates as zeroth-order resonator if there is no dc magnetic field, and the radiation beam directs to broadside. By increasing an externally applied dc magnetic field normal to the substrate, the effective dc magnetization in the ferrite increases under the unsaturated regime. The phase gradient of the field distribution along the resonator is then continuously increased. As a result, the radiation beam direction changes obliquely with respect to broadside. Continuous backfire-to-endfire beam steering with more than 40 degrees was achieved with almost constant gain of 5 dBi. In addition, numerical simulation results show considerably high radiation efficiency of 85%-95%, and the measured beam angle and gain were found almost constant within the relative bandwidth of 2%.

引用

页码：3043 / 3054

页数：12

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