Tri-band bandpass filter using modified tri-section and stub-loaded stepped impedance resonators

Wenguang Li; Guoan Wu; Xiang Zhang

doi:10.1587/elex.14.20161237

This article has now been updated. Please use the final version.

Tri-band bandpass filter using modified tri-section and stub-loaded stepped impedance resonators

Wenguang Li, Guoan Wu, Xiang Zhang

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Keywords: microstrip bandpass filter, tri-band, stub-loaded resonator, modified tri-section SIR

JOURNAL FREE ACCESS Advance online publication

Article ID: 14.20161237

DOI https://doi.org/10.1587/elex.14.20161237

The final version of this article is now available: Vol. 14 (2017), No. 3 pp. 20161237-20161237

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Abstract

In this letter a compact tri-band bandpass filter (BPF) based on a modified tri-section stepped impedance resonator (SIR) and a stub-loaded SIR is proposed. By properly adjusting the resonant modes of the two resonators independently, a tri-band BPF centred at 1.8/3.5/5.2 GHz is designed, corresponding to the GSM, WiMAX, WLAN applications, respectively. Moreover, several transmission zeros (TZs) are generated on each side of the passbands to improve the selectivity. Measured results show good agreement with the simulated results.

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