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A microstrip switched-band impedance transformer for frequency-dependent complex load

Published online by Cambridge University Press:  03 August 2020

Ming-Lin Chuang Open the ORCID record for Ming-Lin Chuang [Opens in a new window] ,
Ming-Tien Wu  and
Shu-Min Tsai
Ming-Lin Chuang*
Affiliation:
Department of Communication Engineering, National Penghu University of Science and Technology, Penghu, Taiwan
Ming-Tien Wu
Affiliation:
Department of Communication Engineering, National Penghu University of Science and Technology, Penghu, Taiwan
Shu-Min Tsai
Affiliation:
Department of Communication Engineering, National Penghu University of Science and Technology, Penghu, Taiwan
*
Author for correspondence: Ming-Lin Chuang, E-mail: morris@npu.edu.tw
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Abstract

This study presents a simple switched-band impedance transformer using microstrip lines. The proposed circuit is suitable for loads with frequency-dependent complex impedances at two arbitrary operating frequencies. The transformer comprises two cascaded microstrip lines and two detachable shunt stepped-impedance stubs, which are separately connected to the main line via switching diodes such that provide good matching at one of the two operating frequencies and suppress unwanted signal at the other frequencies. The structure contains several user-set parameters such that designers can create a smaller circuit. The circuit parameters, except the user-set ones, are obtained using the derived design formula. The numerical simulations and experimental results agree well such that validate the proposed structure and the design formula.

Keywords

Impedance transformerswitched-bandmatching network
Type
Passive Components and Circuits
Information
International Journal of Microwave and Wireless Technologies , Volume 13 , Issue 3 , April 2021 , pp. 234 - 239
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Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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