Vol. 103

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2022-03-21

A Novel Tunable LC Bandpass Filter with Constant Bandwidth Based on Magnetic Dominant Mixed Coupling

By Longchuan Liu, Qian-Yin Xiang, Dinghong Jia, Xiaoguo Huang, and Quanyuan Feng
Progress In Electromagnetics Research Letters, Vol. 103, 73-79, 2022
doi:10.2528/PIERL22020301

Abstract

In this paper, a novel tunable LC bandpass filter (BPF) based on LC magnetic-dominant mixed coupling is proposed. The design equations for the coupling coefficient and resonating frequency are given. The magnetic dominant coupling region and electric dominant coupling region are studied. The magnetic-dominant mixed coupling is used to compensate the bandwidth of the tunable filter, so that the tunable filter with constant absolute bandwidth can be obtained. The filter is designed, simulated and measured, and the measurement matches the simulation very well. The measurement shows that the central frequency tuning range is from 72 MHz to 222 MHz with -3dB bandwidth of 16.5±3.5 MHz.

Citation


Longchuan Liu, Qian-Yin Xiang, Dinghong Jia, Xiaoguo Huang, and Quanyuan Feng, "A Novel Tunable LC Bandpass Filter with Constant Bandwidth Based on Magnetic Dominant Mixed Coupling," Progress In Electromagnetics Research Letters, Vol. 103, 73-79, 2022.
doi:10.2528/PIERL22020301
http://www.jpier.org/PIERL/pier.php?paper=22020301

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