A Hybrid Circuit for Spoof Surface Plasmons and Spatial Waveguide Modes to Reach Controllable Band-Pass Filters.
A Hybrid Circuit for Spoof Surface Plasmons and Spatial Waveguide Modes to Reach Controllable Band-Pass Filters.
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DOI：
10.1038/srep16531
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发表时间：
2015-11-10
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;Wu H;Cui TJ
为了研制新型微波器件，我们提出了一种表面等离子体激元欺骗(SPP)和空间波导模式的混合电路。该混合电路包括一个由两个反对称波纹金属条组成的假SPP波导和一个传统的基片集成波导(SIW)。从色散关系可以看出，只有当工作频率小于SPP波导的截止频率而大于SIW的截止频率时，电磁波才能在混合电路中传播，从而产生高效的带通滤波器。通过设计SPP波导和SIW的几何参数，证明了通带在很大范围内是可控的。全波仿真表明，包括超宽带和窄带滤波器在内的滤波器具有很大的可调性。在微波频段制作了新型混合器件的样品，测量结果与数值模拟结果吻合较好，表现出低损耗、高效率和良好的平方比等优良的滤波特性。提出的混合电路为加速微波和太赫兹频率的等离子体集成功能器件和电路的发展提供了重要的潜力。
We propose a hybrid circuit for spoof surface plasmon polaritons (SPPs) and spatial waveguide modes to develop new microwave devices. The hybrid circuit includes a spoof SPP waveguide made of two anti-symmetric corrugated metallic strips and a traditional substrate integrated waveguide (SIW). From dispersion relations, we show that the electromagnetic waves only can propagate through the hybrid circuit when the operating frequency is less than the cut-off frequency of the SPP waveguide and greater than the cut-off frequency of SIW, generating efficient band-pass filters. We demonstrate that the pass band is controllable in a large range by designing the geometrical parameters of SPP waveguide and SIW. Full-wave simulations are provided to show the large adjustability of filters, including ultra wideband and narrowband filters. We fabricate a sample of the new hybrid device in the microwave frequencies, and measurement results have excellent agreements to numerical simulations, demonstrating excellent filtering characteristics such as low loss, high efficiency, and good square ratio. The proposed hybrid circuit gives important potential to accelerate the development of plasmonic integrated functional devices and circuits in both microwave and terahertz frequencies.