Miniaturized Dual-Band Bandpass Filter Using Embedded Dual-Mode Resonator with Controllable Bandwidths

Chuanming Zhu; Jin Xu; Wei Kang; Zhenxin Hu; Wen Wu

doi:10.1515/freq-2015-0195

Article

Miniaturized Dual-Band Bandpass Filter Using Embedded Dual-Mode Resonator with Controllable Bandwidths

Chuanming Zhu , Jin Xu , Wei Kang , Zhenxin Hu and Wen Wu

Published/Copyright: July 2, 2016

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From the journal Frequenz Volume 70 Issue 9-10

Abstract

In this paper, a miniaturized dual-band bandpass filter (DB-BPF) using embedded dual-mode resonator (DMR) with controllable bandwidths is proposed. Two passbands are generated by two sets of resonators operating at two different frequencies. One set of resonators is utilized not only as the resonant elements that yield the lower passband, but also as the feeding structures with source-load coupling to excite the other to produce the upper passband. Sufficient degrees of freedom are achieved to control the center frequencies and bandwidths of two passbands. Moreover, multiple transmission zeros (TZs) are created to improve the passband selectivity of the filter. The design of the filter has been demonstrated by the measurement. The filter features not only miniaturized circuit sizes, low insertion loss, independently controllable central frequencies, but also controllable bandwidths and TZs.

Keywords: Bandpass filter (BPF); controllable bandwidths; dual-band; mixed coupling

Funding statement: This work was supported in part by the Fundamental Research Funds for Central Universities under Grant No.30920140122005, and in part by the National Natural Science Foundation of China (NSFC) under Grant 61401358 and 61401202.

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Received: 2015-9-8

Published Online: 2016-7-2

Published in Print: 2016-9-1

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Articles in the same Issue

https://doi.org/10.1515/freq-2015-0195

Keywords for this article

Bandpass filter (BPF); controllable bandwidths; dual-band; mixed coupling