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An Ultra-Compact Planar Bandpass Filter With Open-Ground Spiral for Wireless Application

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4 Author(s)
Kaixue Ma ; MEDS Technol. Pte. Ltd., Singapore ; Kiat Seng Yeo ; Jian-Guo Ma ; Manh Anh Do

A common via filter is investigated and designed by using a proposed scalable lumped circuit model. The model-based result of the filter agrees well with that of the measurement. An ultra-compact open-ground spiral filter is proposed based on the common via filter. The open-ground spiral resonators are used to design second-order and fourth-order bandpass filters. The filter layouts, which affect filter performance in both passband and stopband, are investigated. The advantages of the open-ground spiral filter include not only its ultra-compact size (only ) but also its additional transmission zero points and controllable stopband.

Published in:

IEEE Transactions on Advanced Packaging  (Volume:31 ,  Issue: 2 )