Suppression of microstrip filter spurious responses using frequency-selective resistive elements

Frederick Huang

Research output: Contribution to journalArticlepeer-review

Abstract

The spurious responses of microstrip filters were suppressed to extend the stop band. Even-order spurious resonances are suppressed using resistive loads at the voltage nodes of the fundamental resonance, which are the antinodes at the spurious frequency. Odd orders are removed using additional resonators which are deliberately lossy, and whose fundamental resonant frequency is equal to the spurious resonance of the main resonators. Equations for initial estimates for losses and required coupling coefficients are given. Of three filters designed and measured, two show 30 dB stop band attenuation, at the cost of only a small increase in pass-band loss and a small increase in substrate area.
Original languageEnglish
Pages (from-to)1836-1843
Number of pages8
JournalIET Microwaves Antennas & Propagation
Volume5
Issue number15
DOIs
Publication statusPublished - 1 Dec 2011

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