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A Compact Wideband SIW Bandpass Filter with Wide Stopband and High Selectivity

State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System, College of Electronic Science, National University of Defense Technology, Changsha 410073, China
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Electronics 2019, 8(4), 440; https://doi.org/10.3390/electronics8040440
Received: 11 March 2019 / Revised: 8 April 2019 / Accepted: 15 April 2019 / Published: 17 April 2019
(This article belongs to the Section Microwave and Wireless Communications)
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Abstract

A novel method to design a wideband substrate integrated waveguide (SIW) bandpass filter (BPF) with compact size, wide stopband and high selectivity is presented. In this method some unique electromagnetic band-gap (EBG) cells are periodically etched on the top layer of SIW to realize a wide passband propagating below the equivalent waveguide cutoff frequency. By changing the configuration of EBG cells, undesired harmonics in upper stopband can be suppressed and a wideband BPF with wide stopband can be obtained. By symmetrically loading two complementary split ring resonators (CSRRs) on the tapered gradient lines of the input/output ports, a transmission zero near the passband can be introduced, and it makes the frequency selectivity of upper sideband improve significantly. As a verification, a wideband SIW BPF with a 3.02 GHz absolute bandwidth (ABW) and a 64.7% fractional bandwidth (FBW) centered at 4.67 GHz is designed, simulated, manufactured, and measured. The results of the experiment and simulation are in good agreement. View Full-Text
Keywords: wideband; bandpass filter; substrate integrated waveguide (SIW); compact microstrip resonant cell (CMRC); complementary split ring resonator (CSRR); transmission zero (TZ) wideband; bandpass filter; substrate integrated waveguide (SIW); compact microstrip resonant cell (CMRC); complementary split ring resonator (CSRR); transmission zero (TZ)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Huang, L.; Yuan, N. A Compact Wideband SIW Bandpass Filter with Wide Stopband and High Selectivity. Electronics 2019, 8, 440.

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