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High-selectivity ultra-wideband balanced bandpass filter with harmonic suppression

Published online by Cambridge University Press:  03 March 2025

Shipeng Zhao ,
Zhongbao Wang Open the ORCID record for Zhongbao Wang [Opens in a new window] ,
Hongmei Liu Open the ORCID record for Hongmei Liu [Opens in a new window]  and
Shaojun Fang
Shipeng Zhao
Affiliation:
School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, China
Zhongbao Wang*
Affiliation:
School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, China Liaoning Key Laboratory of Radio Frequency and Big Data for Intelligent Applications, Liaoning Technical University, Huludao, Liaoning, China
Hongmei Liu
Affiliation:
School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, China
Shaojun Fang
Affiliation:
School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, China
*
Corresponding author: Zhongbao Wang; Email: wangzb@dlmu.edu.cn
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Abstract

A novel high-selectivity ultra-wideband (UWB) balanced bandpass filter (BPF) with harmonic suppression characteristics is proposed. The differential-mode UWB passband is constructed using quarter-wavelength asymmetrical parallel-coupled transmission lines, resulting in sharp filtering selectivity, while common-mode noises are suppressed by loading the T-type stubs. A simple design method of integrating bandstop filter branches into the BPF for third harmonic suppression without increasing the circuit size is described and confirmed. A planar high-selectivity balanced BPF prototype is manufactured and measured at 2.6 GHz with a measured 3-dB fractional bandwidth of 108% to validate the framework principle. More importantly, with third harmonic suppression characteristics, the measured out-of-band rejection is more than 20 dB, spanning 4.35 GHz until 12.4 GHz.

Keywords

Balanced bandpass filtercommon-mode suppressionharmonic suppressionUWB

Information

Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 17 , Issue 1 , February 2025 , pp. 55 - 64
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Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association.

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