Suppression of Harmonics in Microstrip Filters with Stagger Tuning and Voltage Redistributions

Frederick Huang

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
346 Downloads (Pure)

Abstract

The stop bands of microstrip filters were extended by additional stubs to alter the resonant frequencies of the 2nd and 3rd harmonics, making the resonators stagger tuned. The stubs also change the voltage distributions in the resonators, modifying the coupling coefficients. Equations for estimating the frequency shifts are given, and the operating principle of the voltage redistributions is discussed. Harmonics were suppressed to better than -34 dB in measured filters with 22%, 15%, and 8% bandwidth, with no measurable increase in passband attenuation.
Original languageEnglish
Article number10.1109/TMTT.2014.2303939
Pages (from-to)464-471
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Volume62
Issue number3
DOIs
Publication statusPublished - Mar 2014

Keywords

  • harmonic suppression
  • microstrip filters,
  • spurious response suppression
  • stubs.

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