A series of compact rejection filters based on the interaction between spoof SPPs and CSRRs.
A series of compact rejection filters based on the interaction between spoof SPPs and CSRRs.
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DOI：
10.1038/srep28256
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发表时间：
2016-06-21
影响因子：
4.6
通讯作者：
Cui TJ
中科院分区：
文献类型：
--
作者：
Zhang Q;Zhang HC;Yin JY;Pan BC;Cui TJ
提出了一种在表面等离子体激元（SPP）传输线上刻蚀开口环谐振器（SRR）来合成带阻滤波器的方法。根据色散关系，当工作频率小于截止频率时，波纹带可以支持欺骗SPP模式。SPP模式垂直于条带表面的电场分量可以激发互补SRR（CSRR），导致谐振模式阻止SPP在谐振频率附近的传播。利用这一原理，单频带阻滤波器，双频带阻滤波器和宽带阻滤波器的带宽为1.5 GHz的设计和制造使用的单面和/或双面波纹带。测试结果和数值模拟结果表明，所有设计都具有良好的滤波特性，两者吻合良好。所有滤波器的隔离度都可以小于−20 dB，在抑制频率处甚至可以达到−38 dB。提出的抑制和阻带滤波器提供了重要的潜力，开发集成等离子体功能器件和电路在微波和太赫兹频率。
We propose a method to synthesize several band-rejection filters by etching split-ring resonators (SRRs) on the transmission line for spoof surface plasmon polaritons (SPPs), which is made of double-side or single-side corrugated metal strips. From dispersion relations, the corrugated strips can support spoof SPP modes when the operating frequency is less than the cutoff frequency. The electric field component perpendicular to the strip surface of the SPP modes can excite the complementary SRRs (CSRRs), leading to resonant modes preventing the SPP propagation near the resonant frequencies. Using this principle, single-frequency rejection filters, double-frequency rejection filters, and broad band-stop filters with bandwidth of 1.5 GHz have been designed and fabricated using the single- and/or double-side corrugated strips. Both measured results and numerical simulations demonstrate the excellent filtering characteristics of all design, which are in good agreements. The isolation of all filters can be less than −20 dB, and even reach to −38 dB at rejection frequencies. The proposed rejection and stop-band filters give important potentials to develop integrated plasmonic functional devices and circuits at microwave and terahertz frequencies.