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Design of a wideband isolated out-of-phase filtering power divider/combiner with sharp selectivity

Published online by Cambridge University Press:  13 March 2023

Xuedao Wang Open the ORCID record for Xuedao Wang [Opens in a new window] ,
Dawei Wang ,
Zai-Cheng Guo  and
Gang Zhang
Xuedao Wang
Affiliation:
School of Electronic and Information Engineering, Jinling Institute of Technology, Nanjing, China Ministerial Key Laboratory of JGMT, Nanjing University of Science and Technology, Nanjing, China
Dawei Wang
Affiliation:
School of Electrical and Automation Engineering, Nanjing Normal University, Nanjing, China
Zai-Cheng Guo*
Affiliation:
School of Electrical and Automation Engineering, Nanjing Normal University, Nanjing, China
Gang Zhang
Affiliation:
School of Electrical and Automation Engineering, Nanjing Normal University, Nanjing, China
*
Author for correspondence: Zai-Cheng Guo, E-mail: 61226@njnu.edu.cn
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Abstract

A new isolated out-of-phase filtering power divider/combiner with high selectivity is presented. Based on a single-layer microstrip, required coupling strength and phase difference are achieved by two pairs of three-line coupled feeding structures. To realize desired bandpass responses, a specific resonator is located between the input and output coupled structures. By connecting a half-wavelength transmission line which is centrally loaded with a grounded resistor between two output ports, high port-to-port isolation is attained. Based on the impedance matrix of coupled three-line structure, theoretical filtering responses are predicted with the specified bandwidth and return loss. For demonstration, a prototype is designed, fabricated, and tested. Both simulated and measured results are displayed to verify the design mechanism.

Keywords

Filterspassive components and circuitspower dividers/combiners
Type
Passive Components and Circuits
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Issue 5 , June 2023 , pp. 727 - 733
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Copyright
© The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association

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