Frequency-Tunable Absorptive Bandpass Filter Using Substrate-Integrated Waveguide Structure

Seong Wook Jeong, Gyuwon Lee, Jongheun Lee, Juseop Lee

Research output: Contribution to journalArticlepeer-review

Abstract

This work, for the first time, presents an absorptive frequency-tunable substrate-integrated waveguide (SIW) filter. For the filter design, an absorptive bandpass filter prototype tailored to an SIW structure has been formulated. The proposed absorptive bandpass filter prototype is capable of having a return loss larger than 20 dB at all frequencies although it has a simple matching circuit. The filter prototype has been attained by comprehensive formula-based synthesis of a new matching circuit equivalent to an existing one. To validate our filter prototype, a second-order absorptive bandpass filter that can alter its center frequency has been designed, fabricated, and measured. This article demonstrates approaches to find physical dimensions by comparing each section of the filter structure with the corresponding part of the prototype. The fabricated absorptive bandpass filter has a compact structure by virtue of its simple matching section. The frequency-tunable SIW resonators allow our absorptive bandpass filter to adjust its center frequency from 1.76 to 2.69 GHz while having absorptive performance. The measured reflection of the filter centered at 2.50 GHz is smaller than -10 dB between 1.56 and 3.27 GHz (2.10:1). It is shown that theory, simulation results, and measured responses are in good agreement.

Original languageEnglish
Pages (from-to)5351-5359
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Volume69
Issue number12
DOIs
Publication statusPublished - 2021 Dec 1

Keywords

  • Absorptive filter
  • frequency-tunable filter
  • nonplanar filter
  • substrate-integrated waveguide (SIW) resonator

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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