一种提高频率选择表面通带透射比的新方法

为得到带宽较窄且透射比较高的频率选择表面（FSS）结构，以Y环单元为基础提出了一种提高通带透射比的新方法，即在周期单元内设置圆形孔径，运用谱域Galerkin方法对这种结构的传输特性进行了数值分析，确定R=0.4 mm，单元周期内圆孔个数为12，中心频点15 GHz的透射比提高0.12 dB；采用镀膜与光刻相结合的技术制备了相应的试验件，并进行了微波测试，测试值与计算值基本一致。结果表明，开圆孔Y环的中心频点透射比在电磁波垂直入射的情况下为-0.69 dB，比对应Y环提高0.16 dB，而在30°和45°倾斜入射的情况下，TE波的透射比分别为-0.64 dB和-0.78 dB，比对应Y环分别提高了0.345 dB和0.31 dB，-3 dB带宽分别为1.26 GHz和0.97 GHz，两种结构的带宽基本一致。因此这种方法是大周期下提高通带透射比的有效方法。

Abstract

Based on a Y loop element, a new method which sets circular slot on the periodic element to improve frequency selective surface (FSS) structure of narrow bandwidth and high transmittance is presented. The FSS structure is calculated by Galerkin′s method in spectral domain. The optimum radius is 0.4 mm, and the numbers of the circular slot is 12. The resonance frequency is 15 GHz, and its transmittance is increased 0.12 dB. The plane sample is fabricated by depositing coatings and lithography. The agreement between the calculated and measured values is good. Compared with the Y loop without circular slot, the results show that the transmittance of this structure which is about -0.69 dB at the resonance frequency increased 0.16 dB under the normal incidence. The transmittance at TE 30° and 45° incidence are -0.64 dB and -0.78 dB, respectively. Compared with the Y loop without circular slot, the transmittance are increased about 0.345 dB and 0.31 dB, respectively. And the bandwidth difference between the two structures is negligible, and they are about 1.26 GHz and 0.97 GHz under TE 30° and 45° incidence, respectively. So this method is an effective way to improve the transmittance of large periodic FSS structure at resonance frequency.

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朱华新, 高劲松, 冯晓国, 赵晶丽, 梁凤超, 王岩松, 陈新. 一种提高频率选择表面通带透射比的新方法[J]. 光学学报, 2011, 31(2): 0223002. Zhu Huaxin, Gao Jinsong, Feng Xiaoguo, Zhao Jingli, Liang Fengchao, Wang Yansong, Chen Xin. A New Method of Improving Frequency Selective Surface Passband Transmittance[J]. Acta Optica Sinica, 2011, 31(2): 0223002.

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