COMPACT TRIPLE-BAND BANDPASS FILTER USING MULTI-MODE RESONATOR (MMR) WITH MULTIPLE TRANSMISSION ZEROS

Year 2015, Volume: 15 Issue: 2, 1945 - 1950, 01.12.2015

Xuebin Tang , Shuping Jın

Abstract

In this article, a compact triple-band microstrip bandpass filter (BPF) with tunable centre frequencies and
bandwidths as well as multiple transmission zeros (TZs) is presented. The proposed filter is designed based on a novel
multi-mode resonator (MMR), and the even-/odd-mode analysis method is employed to investigate its resonant
characteristics. By changing the lengths of two loaded coupled open stubs and coupling space between them, two
resonant modes can be tuned and the bandwidth can be controlled. Also, two additional TZs are generated due to the
dual-finger feed structure. Moreover, these two TZs can be controlled by the lengths of two fingers, and high passband
selectivity and band-to-band isolation level are achieved with ten TZs. The three centre frequencies of the proposed
triple-band BPF are located at 1.9, 3.55, and 7.33 GHz, respectively. In addition, the overall circuit size of the
fabricated filter is much smaller in comparison with previous works. For demonstration, a prototype filter is fabricated
and measured, and good agreements are obtained between the measured results and electromagnetic (EM) simulated
ones

Keywords

Bandpass filter (BPF), multi-mode resonator (MMR), transmission zeros, triple-band filter

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