Design of a compact microstrip balanced‐to‐balanced filtering power divider with real impedance‐transformation functionality
Abstract A microstrip balanced‐to‐balanced filtering power divider (FPD) design with impedance transformation via a coupled three‐line balun structure is proposed. The even/odd mode‐analysis method is used to construct a three‐port balun bandpass filter (BPF) with stub‐loaded resonators and a three‐...
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doaj-c360cef655fd411184e0eab2af22396e2021-07-14T13:25:55ZengWileyIET Microwaves, Antennas & Propagation1751-87251751-87332021-04-0115548149410.1049/mia2.12059Design of a compact microstrip balanced‐to‐balanced filtering power divider with real impedance‐transformation functionalityXuedao Wang0Min Wang1Gang Zhang2Lei Zhu3Wai‐Wa Choi4Jianpeng Wang5Ministerial Key Laboratory of JGMT Nanjing University of Science and Technology Nanjing ChinaMinisterial Key Laboratory of JGMT Nanjing University of Science and Technology Nanjing ChinaSchool of Electrical and Automation Engineering Nanjing Normal University Nanjing ChinaDepartment of Electrical and Computer Engineering Faculty of Science and Technology University of Macau Macao ChinaDepartment of Electrical and Computer Engineering Faculty of Science and Technology University of Macau Macao ChinaMinisterial Key Laboratory of JGMT Nanjing University of Science and Technology Nanjing ChinaAbstract A microstrip balanced‐to‐balanced filtering power divider (FPD) design with impedance transformation via a coupled three‐line balun structure is proposed. The even/odd mode‐analysis method is used to construct a three‐port balun bandpass filter (BPF) with stub‐loaded resonators and a three‐line output structure after analysis and design to prescribe the filtering response of a proposed balanced‐to‐balanced FPD. To realize good isolation between the differential output ports, a complex impedance‐isolation network is loaded by means of coupled lines in the input‐feeding section. Theoretical formulas characterized by the coupling factors are provided with a specified source and load impedance ratio under the condition of perfect impedance matching at the centre frequency. According to the calculated S‐parameters, design rules are summarized to determine the overall circuit size according to desired bandwidth and return loss. For validation, two balanced‐to‐balanced FPDs centred at 2.4 GHz with 50‐to‐50 Ω matching and 50‐to‐100 Ω transformation are designed, fabricated and tested. Good agreement between the simulated and tested results of the designed balanced‐to‐balanced impedance‐transforming FPDs indicates not only high common‐mode rejection but also good port‐to‐port isolation and good matching at all ports.https://doi.org/10.1049/mia2.12059 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xuedao Wang Min Wang Gang Zhang Lei Zhu Wai‐Wa Choi Jianpeng Wang |
spellingShingle |
Xuedao Wang Min Wang Gang Zhang Lei Zhu Wai‐Wa Choi Jianpeng Wang Design of a compact microstrip balanced‐to‐balanced filtering power divider with real impedance‐transformation functionality IET Microwaves, Antennas & Propagation |
author_facet |
Xuedao Wang Min Wang Gang Zhang Lei Zhu Wai‐Wa Choi Jianpeng Wang |
author_sort |
Xuedao Wang |
title |
Design of a compact microstrip balanced‐to‐balanced filtering power divider with real impedance‐transformation functionality |
title_short |
Design of a compact microstrip balanced‐to‐balanced filtering power divider with real impedance‐transformation functionality |
title_full |
Design of a compact microstrip balanced‐to‐balanced filtering power divider with real impedance‐transformation functionality |
title_fullStr |
Design of a compact microstrip balanced‐to‐balanced filtering power divider with real impedance‐transformation functionality |
title_full_unstemmed |
Design of a compact microstrip balanced‐to‐balanced filtering power divider with real impedance‐transformation functionality |
title_sort |
design of a compact microstrip balanced‐to‐balanced filtering power divider with real impedance‐transformation functionality |
publisher |
Wiley |
series |
IET Microwaves, Antennas & Propagation |
issn |
1751-8725 1751-8733 |
publishDate |
2021-04-01 |
description |
Abstract A microstrip balanced‐to‐balanced filtering power divider (FPD) design with impedance transformation via a coupled three‐line balun structure is proposed. The even/odd mode‐analysis method is used to construct a three‐port balun bandpass filter (BPF) with stub‐loaded resonators and a three‐line output structure after analysis and design to prescribe the filtering response of a proposed balanced‐to‐balanced FPD. To realize good isolation between the differential output ports, a complex impedance‐isolation network is loaded by means of coupled lines in the input‐feeding section. Theoretical formulas characterized by the coupling factors are provided with a specified source and load impedance ratio under the condition of perfect impedance matching at the centre frequency. According to the calculated S‐parameters, design rules are summarized to determine the overall circuit size according to desired bandwidth and return loss. For validation, two balanced‐to‐balanced FPDs centred at 2.4 GHz with 50‐to‐50 Ω matching and 50‐to‐100 Ω transformation are designed, fabricated and tested. Good agreement between the simulated and tested results of the designed balanced‐to‐balanced impedance‐transforming FPDs indicates not only high common‐mode rejection but also good port‐to‐port isolation and good matching at all ports. |
url |
https://doi.org/10.1049/mia2.12059 |
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