Miniaturized Quad-Band Filter Design Using Substrate Integrated Coaxial Cavity
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Updated: Aug 8, 2025

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
Published on: February 4, 2018
Chung-I G Hsu1, Wanchu Hong2, Mingchih Chen3
1Department of Electrical Engineering, College of Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan.
Abstract:
We propose a miniaturized quad-band filter (QBF), designed using substrate-integrated coaxial cavities (SICCs). The employed SICC structure consists of two vertically stacked substrates with a large circular patch embedded in between. The embedded patch is segmented unevenly into four pieces, which are shorted to the cavity's bottom wall through one or two blind vias. This SICC structure exhibits four independently controlled resonances with frequencies much lower than the frequency of its conventional SIW cavity counterpart, thus achieving size reduction. A sample quad-band filter is designed and fabricated for experimental measurement. Reasonably good agreement between measured and simulated data is observed.
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