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The Design of New Structures of Planar Diplexers Using Microstrip Resonators

The Design of New Structures of Planar Diplexers Using Microstrip Resonators
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Author(s): Abdessamed Chinig (Hassan 1st University, Morocco), Ahmed Errkik (University of Hassan 1st, Morocco), Abdelali Tajmouati (Hassan 1st University, Morocco), Hamid Bennis (Hassan 1st University, Morocco), Jamal Zbitou (University of Hassan 1st, Morocco) and Mohamed Latrach (Microwave Group, ESEO, France)
Copyright: 2017
Pages: 35
Source title: Handbook of Research on Advanced Trends in Microwave and Communication Engineering
Source Author(s)/Editor(s): Ahmed El Oualkadi (Abdelmalek Essaadi University, Morocco) and Jamal Zbitou (University of Hassan 1st, Morocco)
DOI: 10.4018/978-1-5225-0773-4.ch006


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In this chapter, three planar diplexers based on microstrip resonators are presented. An overview on diplexers is introduced. Then, two designed and fabricated microstrip diplexers with compact size and good performances are exposed. The first diplexer is designed using open loop resonators while the second circuit is achieved based on triangular loop resonators. The third structure represents a compact diplexer designed by using a pair of H-shaped resonators coupled with a coupling patch and two Input/Output (I/O) feed lines. The incorporated slots in the ground plane of the proposed circuit allow the control of the resonant frequencies and enhance its electrical performances. Furthermore, the introduction of these slots represents an interesting solution to miniaturize the microwave filter and diplexer. An analytic method is applied to extract the equivalent LC model of the band pass filters and diplexer. A full wave electromagnetic Analysis is achieved to evaluate the electrical performances of the proposed diplexers by using ADS and CST-MWS.

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