volume | PIER Journals

2019-12-11

A New Compact UWB Bandpass Filter with Quad Notched Characteristics

Fengjing Liu,

Dr. Fengjing Liu

Mechanical and Electronic Engineering Department

Yantai Automobile Engineering Professional College

China

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Mao Qun

Dr. Mao Qun

School of Electronic Information and Automation

Aba Normal College

China

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Progress In Electromagnetics Research Letters, Vol. 88, 83-88, 2020

doi:10.2528/PIERL19090505

Abstract

A new approach to design a microstrip ultra-wideband (UWB) bandpass filter (BPF) with quad sharply notched bands and good selectivity is proposed using quad parallel defected microstrip structures (PDMSs). The initial UWB BPF comprises interdigital coupled lines and an E-shaped multiple-mode resonator (EMMR) to achieve two transmission zeros on both sides of the passband thus to improve skirt selectivity. Then, four PDMSs are introduced, which have the properties of achieving four band-notched characteristics and provide high degree of adjusting freedom. To validate the design theory, a new microstrip UWB BPF with four notched bands respectively centered at 5.3, 5.9, 6.4, and 7.4 GHz is designed and fabricated. Both simulation and experimental results are provided with good agreement. The designed methodology is very efficient and useful for filter synthesis though the design principle is simple.

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Fengjing Liu, and Mao Qun, "A New Compact UWB Bandpass Filter with Quad Notched Characteristics," Progress In Electromagnetics Research Letters, Vol. 88, 83-88, 2020.
doi:10.2528/PIERL19090505

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