Microstrip open-loop ring bandpass filter using open stubs for harmonic suppression

Wen Hua Tu, Huifeng Li, Krzysztof A. Michalski, Kai Chang

Research output: Contribution to journalConference articlepeer-review

18 Scopus citations

Abstract

Improved harmonic suppression is achieved by adding small shunt open stubs to a conventional open-loop bandpass filter. A design curve for the shunt open stub is derived using the ABCD matrix calculation. The insertion loss of the four-pole filter is 3 dB at 1.8385 GHz, and the return loss is better than 10 dB within 1.7935-1.8835 GHZ. The suppression of the modified filter is better than 30 dB below 1.7 GHz and between 2-6 GHz, while the conventional filter shows a spurious passband at 3.7 GHz.

Original languageEnglish
Article number4014903
Pages (from-to)357-360
Number of pages4
JournalIEEE MTT-S International Microwave Symposium Digest
DOIs
StatePublished - 2006
Event2006 IEEE MTT-S International Microwave Symposium Digest - San Francisco, CA, United States
Duration: 11 Jun 200616 Jun 2006

Keywords

  • Harmonic suppression
  • Open-loop bandpass filter
  • Ring filter

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