Multiband High-Order Bandstop 3-D Frequency-Selective Structures
Multiband High-Order Bandstop 3-D Frequency-Selective Structures
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DOI：
10.1109/tap.2016.2546967
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发表时间：
2016-03
影响因子：
5.7
通讯作者：
A. Omar;Z. Shen
中科院分区：
文献类型：
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作者：
A. Omar;Z. Shen
提出了一种设计多频带高阶三维选频结构的一般方法。该方法是基于采用多个谐振器内的一个单元格（UC），以获得多频带响应，并通过控制相同的谐振器之间的耦合，实现了高阶滤波性能。这在工作频带中提供了更多的传输零点，这导致改善的带宽和高选择性。文中对相同谐振器之间的耦合进行了详细的分析，并给出了等效电路模型来解释其工作原理。三个结构的设计，制造和测量，以验证所提出的方法。第一种结构是中心频率为9.6、13.4和17.5 GHz的三频带二阶FSS，其-3 dB分数带宽分别为13.5%、8.5%和12.6%。第二种结构被设计为具有中心频率为13.2和19.6 GHz的双频三阶响应，其-3-dB分数带宽分别为16%和13.3%。最后一种结构被设计为在TE和TM偏振下具有双频带二阶响应，中心频率为11.2和13.8 GHz，-3 dB分数带宽分别为5.5%和4%。
A general methodology for the design of multiband high-order three-dimensional (3-D) frequency-selective structures (FSSs) is proposed. The methodology is based on employing multiple resonators inside a unit cell (UC) to obtain a multiband response, and by controlling the coupling between identical resonators, a high-order filtering performance is achieved. This provides more transmission zeros in the operating bands, which lead to improved bandwidth and high selectivity. Detailed analysis for the coupling between identical resonators is provided as well as equivalent circuit models to explain the operating principle. Three structures are designed, fabricated, and measured to verify the proposed methodology. The first structure is a triband secondorder FSS with center frequencies at 9.6, 13.4, and 17.5 GHz and their -3-dB fractional bandwidths of 13.5%, 8.5%, and 12.6%, respectively. The second structure is designed to have a dualband third-order response with center frequencies at 13.2 and 19.6 GHz and their -3-dB fractional bandwidths of 16% and 13.3%, respectively. The last structure is designed to exhibit a dual-band second-order response under both TE and TM polarizations with center frequencies at 11.2 and 13.8 GHz and -3-dB fractional bandwidths of 5.5% and 4%, respectively.