基于人工表面等离子体激元的小型化低通双陷波滤波器

Miniaturized Low-Pass Double Notch Filter Based on Spoof Surface Plasmon Polaritons

该文提出了一种由单边复合周期人工表面等离子体激元(SSPPs)波导和叉指谐振器构成的新型小型化低通双陷波滤波器。该滤波器首先去除了传统SSPPs滤波器的模式转换结构,有效地减小了滤波器的尺寸,从而实现滤波器的小型化。此外,该滤波器分别在SSPPs传输线和底部金属板引入叉指谐振器,从而产生两个传输零点,实现了两个可独立调谐的陷波。仿真与实测结果均表明,该文所提出的滤波器具有较高的传输效率,其截止频率为8.3 GHz,带内的回波损耗低于16.6 dB,陷波抑制均达到20 dB。

In this paper,a novel miniaturized low-pass double notch filter composed of single-sided composite periodic spoof surface plasmon polaritons(SSPPs)waveguides and interdigital resonators was proposed.The mode conversion structure in the conventional SSPPs filters was removed,which effectively reduced the size of the filter,thus realizing the miniaturization of the filter.Furthermore,by introducing two interdigital resonators on the SSPPs transmission line and three ones on the bottom metal plate separately,thereby generating two transmission zeros and achieving two independently tunable notches.The simulated and measured results show that the proposed filter has high transmission efficiency with the cutoff frequency of 8.3 GHz,return loss in the band of less than 16.6 dB,and the notch suppression of 20 dB.