A Compact Microstrip Transversal Coupling Reconfigurable Bandpass Filter with Highly Variable Center Frequency, Bandwidth, and Transmission Zeros

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  • 中心周波数・帯域幅・伝送零点可変の共振器並列結合型小形マイクロストリップリコンフィギュラブルBPF

Abstract

This paper proposes a compact microstrip transversal-coupling reconfigurable filter that can change the frequency selectivity of bandpass filter (BPF), and can also provide an all-stop response. In conventional reconfigurable filters, additional resonators are required to control transmission zeros, which leads to a complicated and large structure. The proposed filter, which is simply realized with the parallel arrangement of even/odd-mode half-wavelength resonators, reconfigure its transfer function by directly adjusting resonant frequencies and external Q factors with electrical controls using varactor diodes loaded on resonators. The prototype filter achieves a center frequency tuning of 1.13-1.69 GHz, 3-dB fractional bandwidth control of 5.3-17.3%, and two highly adjustable transmission zeros at one side or both sides of passband as a BPF, and offers a switch from a bandpass response to an all-stop response. The effectiveness of the proposed structure is proven by the comparison of frequency responses between EM-simulated and measured results.

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