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Multi-band rejection filters based on spoof surface plasmon polaritons and folded split-ring resonators

Published online by Cambridge University Press:  17 April 2019

Luping Li
Affiliation:
School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China Aircraft swarm intelligent sensing and cooperative control Key Laboratory of Sichuan Province, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China
Lijuan Dong
Affiliation:
School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China
Peng Chen*
Affiliation:
School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China Aircraft swarm intelligent sensing and cooperative control Key Laboratory of Sichuan Province, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China
Kai Yang
Affiliation:
School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China Aircraft swarm intelligent sensing and cooperative control Key Laboratory of Sichuan Province, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China
*
Author for correspondence: Peng Chen, E-mail: chenp@uestc.edu.cn

Abstract

A dualband rejection filter and a triband rejection filter are proposed in this letter, both of which are implemented by cascading spoof surface plasmon polaritons (SSPPs) of the same structure but with diverse rejection bands. Compared with traditional ones, the proposed filters provide more compact structures, wider rejection bands, and better independent tunability. In the proposed filters, the rejection bandwidth, the center frequency of the rejection band and the filter's cutoff frequency can be adjusted independently. And the different rejection bands in the same filter also can be independently controlled. Agreements between the dispersion of SSPP units and the S21 of filters are also presented. Measurement results demonstrate that both filters load multiple rejection bands on the 27.7 GHz wide low-pass band and all the rejection bands locate in Ku and K bands. The average rejection bandwidth and the average rejection depth of the two filters are 1.49 GHz and 42.1 dB, respectively.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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