Highly Selective UWB Bandpass Filter with Dual Notch Bands Using Stub Loaded Multiple-mode Resonator

Zhao, Guangxiu; Li, Minquan; Zhao, Ran; Tu, Ziyun; Yan, Yajing; Mo, Xiaming

doi:10.1109/piers53385.2021.9695010

Cited by 5 publications

(1 citation statement)

References 12 publications

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“…Based on the research status of filters [17], the current miniaturization technologies of cavity filters mainly include the following: (1) loading technology [18][19][20], such as resonator capacitor loading, lumped element loading and high permittivity ceramic material loading, etc. ; (2) multi-mode resonator technology [21][22][23][24][25] that, in a resonant cavity, motivates two or more resonant modes simultaneously; (3) spiral resonator [26], short circuit branch [27], slow wave structure [8] and other technologies are used to realize the miniaturization of filters. Generally, as the size of filter decreases, the power capacity of the filter will also decrease.…”

Section: Introductionmentioning

confidence: 99%

Dielectric-Loaded Miniaturized Cavity Bandpass Filter with Improved Power Capacity

Rong

Zhang

2022

Electronics

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A novel design method of dielectric-loaded miniaturized cavity bandpass filter is presented in this paper. The proposed cavity resonator is filled with dielectric material to improve power capacity, while realizing the miniaturization of the filter. To validate our proposal, a bandpass filter with a center frequency of 1475 MHz and bandwidth of 90 MHz is designed, fabricated, and measured. The measured insertion loss is ≤0.49 dB and return loss is ≥20 dB in 1430 MHz~1520 MHz. The measured upper stopband rejection is greater than 48.5 dB in 1575 MHz~2700 MHz. The measured results are in good agreement with the simulation, which verifies the effectiveness and practicability of the method. The metal cavity bandpass filter, filled with dielectric material, is reduced by 25% in the thickness direction and its power capacity is increased by 45.8%.

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