IEICE Electronics Express
Online ISSN : 1349-2543
LETTER
A novel planar tri-band bandpass filter using stub-loaded resonators
Weiping LiZongxi TangHaodong LinXin Cao
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2016 Volume 13 Issue 18 Pages 20160605

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Abstract

This letter presents a novel planar tri-band bandpass filter (BPF) using a set of stepped-impedance resonators (SIRs) and a short-circuited stub-loaded uniform impedance resonator. The former is designed to operate at the first and third passbands and the latter at the second passband. Corresponding equivalent circuit is analyzed by using the even-odd mode theory. Skirt selectivity is obtained due to source-load coupling. For validation, a tri-band BPF with compact size is designed, fabricated, and measured, its center frequencies are located at 2.4, 3.5, 5.15 GHz. Measured results show good performance on insertion loss and return loss.

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© 2016 by The Institute of Electronics, Information and Communication Engineers
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