Ultra-miniaturization design of substrate-integrated waveguide cavity trisection bandpass filter

Muhammad Mimsyad, Chung I.G. Hsu, Min Hua Ho

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The contribution of this work is to propose a novel trisection bandpass filter (BPF) using only one ultra-miniature substrate-integrated waveguide (SIW) cavity. The SIW cavity is composed of two substrate layers and a very thin prepreg layer for binding purpose. A circular patch is deployed on the cavity's middle metal layer and is evenly trisected into three identical pieces. Each piece is shorted to the cavity's bottom face by a blind via. The cavity together with the via-shorted trisected patches form the trisection filter's resonators. This trisected-patch-loaded SIW cavity has the dominant-mode resonance frequency much lower than that of the standard patch-free SIW cavity. The down shift in the resonance frequency of the proposed resonator structure has effectively led to a significant circuit-size reduction. When compared with a three-pole BPF consisting of three standard patch-free SIW cavities, the size reduction rate of our proposed BPF requiring only one SIW cavity is as high as 97.47%, which might be the highest record achieved so far. An experiment has been conducted to verify the proposed circuit design. Besides ultra-circuit miniaturization, the measured upper stopband with the rejection of larger than 20 dB is as wide as 2.38 times the passband center frequency.

Original languageEnglish
Pages (from-to)2826-2831
Number of pages6
JournalMicrowave and Optical Technology Letters
Issue number12
Publication statusPublished - 2019 Dec 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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