宽带谐波抑制天线设计
Design of Wideband Harmonic Rejection Antenna
摘要: 本文针对微波能量采集整流天线的应用，设计了一款宽带滤波天线。该天线由C-CMRC低通滤波器和多层结构的U型缝微带天线组成。首先通过加空气层和在贴片上加载U形缝隙展宽了天线的带宽，然后在馈线上加载低通滤波器对二次和三次谐波进行抑制。天线的实测工作频率范围为2.2 GHz~2.6 GHz，相对带宽约为16%。实测和仿真结果表明天线在二次和三次谐波频率处的回波损耗均小于1 dB。
Abstract:
A broadband filtering antenna is proposed for the rectifying antenna of microwave energy harvesting systems in this paper. The antenna is composed of a C-CMRC filter and a multi-layer U-slot microstrip antenna. The bandwidth is broadened by adding air layer and loading U-slot on the patch. Then, the 2nd and 3rd harmonic are suppressed by loading low-pass filter on the feed-line. The measured results show that an impedance bandwidth from 2.2 GHz to 2.6 GHz, i.e., 16% is obtained. The measured and simulated results show that the return loss is less than 1dB at the 2nd and the 3rd harmonic frequencies.
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