High Efficiency Short Backfire Antenna Using Electromagnetically Hard Walls

被引:14
|
作者
Bray, Matthew G. [1 ]
Lier, Erik [1 ]
机构
[1] Lockheed Martin Space Syst, Newtown, PA 18940 USA
来源
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS | 2015年 / 14卷
关键词
Hard electromagnetic surface; multiobjective genetic algorithm; short backfire antenna; strip-loaded wall;
D O I
10.1109/LAWP.2015.2414301
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
This letter presents a high efficiency short backfire antenna (SBFA) using electromagnetically hard walls. A hard surface composed of low permittivity dielectric liner with longitudinal metal surface strips is affixed to the inside walls of a conventional SBFA's main reflector. The hard-walled SBFA was optimized to operate at L1 and L2 GPS bands with circular polarization using an R2 indicator based evolutionary multiobjective algorithm. A hard-walled SBFA with 2 lambda aperture diameter at L1 achieved 90% and 98% aperture efficiency at L1 and L2, respectively. Also the antenna exhibited more than 90% aperture efficiency over 16% bandwidth around L1. Compared to a conventional SBFA with the same aperture diameter the new antenna achieves 1.25 dB higher directivity at L1 and 0.76 dB at L2, as well as improved cross-polarization due to a more uniform aperture distribution.
引用
收藏
页码:1614 / 1617
页数:4
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