Vol. 41

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2013-06-27

Compact Microstrip Dual-Mode Dual-Band Bandpass Filters Using Stubs Loaded Coupled Line

By Xin Xu and Wen Wu
Progress In Electromagnetics Research C, Vol. 41, 137-150, 2013
doi:10.2528/PIERC13052204

Abstract

This paper presents two novel dual-mode dual-band bandpass filters (BPFs) by using stubs loaded coupled line. The analytical equations of their transmission poles and transmission ze-ros are given by the classical even-/odd-mode method. Design rules for two dual-band BPFs are al-so given, which shows the easily tuned passband frequency locations and in-band performance. As examples, two dual-mode dual-band BPFs, dual-band filter A with central frequencies (CFs) at 3.5/6.8 GHz and -3 dB fractional bandwidth (FBW) of 14%/10%, while dual-band filter B with CFs at 2.4/6.8 GHz and -3 dB FBW of 43%/16% are designed, fabricated and measured. Good agree-ment can be observed between the simulations and measurements. These two filters exhibit simple design procedures, simple physical topology, low insertion losses, good return losses, high isolation and compact sizes.

Citation


Xin Xu and Wen Wu, "Compact Microstrip Dual-Mode Dual-Band Bandpass Filters Using Stubs Loaded Coupled Line," Progress In Electromagnetics Research C, Vol. 41, 137-150, 2013.
doi:10.2528/PIERC13052204
http://jpier.org/PIERC/pier.php?paper=13052204

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