A Novel Highly Selective UWB Bandpass Filter Using Quad-Mode Stub-Loaded Resonator

被引：0
|
作者：
Wei G.Y. [1 ]
Wang Y.X. [1 ]
Liu J. [1 ,2 ]
Gao Y. [1 ]
Yao X.T. [1 ]
机构：
[1] School of Electronic and Information Engineering, China West Normal University, Nanchong
[2] School of Physics and Astronomy, China West Normal University, Nanchong
来源：
Progress in Electromagnetics Research Letters | 2023年 / 109卷
关键词：
Compilation and indexing terms; Copyright 2025 Elsevier Inc;
D O I：
10.2528/PIERL23010502
中图分类号：
学科分类号：
摘要：
In this letter, a novel ultra-wideband (UWB) bandpass filter (BPF) configuration with a quad-mode resonator (QMR) structure is proposed, which has a highly selective and compact performance. The QMR is composed of a funnel-shaped resonator loaded in the middle and a low-impedance folded microstrip line. Initially, the resonant frequencies are uniformly distributed in the UWB passband by varying the length of QMR physical stubs, and later three-line parallel coupled lines are employed to enhance coupling to obtain a flat passband. The feed lines are then loaded with a pair of λ/2 stepped impedance radial stubs (SIRSs) to provide excellent band-stop characteristics. Finally, a filter prototype is created, and its performance is evaluated using the generated data. The proposed UWB filter has sharp roll-off ratio of 99 and 63 dB/GHz, respectively, at the lower and upper edges of the passband. © 2023, Electromagnetics Academy. All rights reserved.
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页码：57 / 63
页数：6
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