Design of a Compact Balanced Bandpass Filter based on CSRR-loaded Substrate Integrated Waveguide Structure

Hao Zhang; Wei Kang; Wen Wu

doi:10.1515/freq-2017-0168

Article

Design of a Compact Balanced Bandpass Filter based on CSRR-loaded Substrate Integrated Waveguide Structure

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Published/Copyright: March 10, 2018

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From the journal Frequenz Volume 72 Issue 7-8

Abstract

A compact balanced bandpass filter (BPF) based on complementary split ring resonator (CSRR) -loaded substrate integrated waveguide (SIW) structure is reported in this paper. Both TE₁₀₂ and TE₂₀₁ modes of the SIW cavity can be excited under differential-mode (DM) operation with the proper positions of the balanced feeds. Meanwhile, the CSRR etched on the top layer of the substrate can also be excited by the axial electric excitation. Then, three transmission poles and two transmission zeros (TZs) have been obtained which improve the selectivity of the DM passband. To verify the above design concept, an X-band prototype operating at 8 GHz has been fabricated and measured. A good agreement is observed between the simulations and the measurements.

Keywords: compact; balanced bandpass filter (BPF); substrate integrated waveguide (SIW); complementary split ring resonator (CSRR)

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Received: 2017-07-25

Published Online: 2018-03-10

Published in Print: 2018-06-26

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https://doi.org/10.1515/freq-2017-0168

Keywords for this article

compact; balanced bandpass filter (BPF); substrate integrated waveguide (SIW); complementary split ring resonator (CSRR)