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Design of a microstrip dual-frequency diplexer using microstrip cells analysis and coupled lines components

Published online by Cambridge University Press:  15 February 2017

Leila Noori  and
Abbas Rezaei
Leila Noori
Affiliation:
Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
Abbas Rezaei*
Affiliation:
Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah, Iran
*
Corresponding author: Abbas Rezaei Emails: Leila_noori62@yahoo.com, unrezaei@yahoo.com
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Abstract

In this paper, a microstrip diplexer composed of two similar resonators is designed. The proposed resonator is consisting of four microstrip cells, which are connected to a coupled lines structure. In order to select a suitable geometric structure, first, all cells are assumed as undefined structures where there is a lack of basic information about their geometry and dimensions. Then, an equivalent LC circuit of the coupled lines is introduced and analyzed to estimate the general structure of the resonator respect to a requested resonance frequency. The proposed diplexer is designed to operate at 2.36 and 4 GHz for wireless applications. The insertion losses (S21 and S31) are decreased significantly at the resonance frequencies, so that they are 0.2 and 0.4 dB at 2.36 and 4 GHz, respectively. The designed diplexer is fabricated and measured and the measurement results are in a good agreement with the simulations.

Keywords

DiplexerCoupled linesMicrostripResonator
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Special Issue 7: EuCAP 2016 special issue , September 2017 , pp. 1467 - 1471
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

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