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Design and analysis of a compact microstrip lowpass–bandpass diplexer with good performance for wireless applications

Published online by Cambridge University Press:  03 January 2023

Abbas Rezaei Open the ORCID record for Abbas Rezaei [Opens in a new window] ,
Salah I. Yahya Open the ORCID record for Salah I. Yahya [Opens in a new window]  and
Leila Nouri Open the ORCID record for Leila Nouri [Opens in a new window]
Abbas Rezaei
Affiliation:
Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah, Iran
Salah I. Yahya
Affiliation:
Department of Communication and Computer Engineering, Cihan University-Erbil, Erbil, Iraq Department of Software Engineering, Faculty of Engineering, Koya University, Koya KOY45, Iraq
Leila Nouri*
Affiliation:
Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam Faculty of Electrical – Electronic Engineering, Duy Tan University, Da Nang 550000, Vietnam
*
Author for correspondence: Leila Nouri, E-mail: leilanouri@duytan.edu.vn
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Abstract

This paper presents the design of a novel lowpass–bandpass diplexer with compact size and good performance using microstrip cells. For this purpose, two microstrip lowpass and bandpass filters are separately designed and mathematically analyzed. The proposed microstrip diplexer has a novel and simple structure. It occupies a compact area of 0.037 λg2 (722 mm2), and its insertion loss and S11 at both channels are low. The insertion loss at the lower and upper channels is only 0.047 and 0.16 dB, respectively. Meanwhile, both channels are flat with the maximum group delay of 1.68 ns which is the lowest compared to the previously reported diplexers mentioned in this paper. To design the proposed diplexer, first, a lowpass diplexer with good performance is designed which has low losses and a good figure of merit. It has a flat passband with a sharp roll-off. Then, to achieve the proposed diplexer, a bandpass resonator is added to the lowpass filter without any extra matching circuit, which saves the overall size. The proposed diplexer is designed, simulated, and fabricated, where the simulation and measurement results are close.

Keywords

Group delayinsertion losslowpass–bandpassmicrostrip diplexerwireless
Type
Filters
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Issue 7 , September 2023 , pp. 1099 - 1107
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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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