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Analog Integrated Circuits and Signal Processing

, Volume 98, Issue 2, pp 377–383 | Cite as

Novel microstrip branch-line coupler with low phase shift for WLANs

  • A. Rezaei
  • L. NooriEmail author
  • S. M. Hosseini
Article
  • 36 Downloads

Abstract

In this work, a novel branch-line coupler is presented using a new type of microstrip cells. The proposed structure is consisting of high and low impedance sections and a main small square closed loops. It operates at 2.4 GHz for WLAN applications. Using the introduced structure, a good passband performance is achieved. An excellent phase balance closed to ideal is obtained with a phase difference of 270 ± 0.037° between output ports. Furthermore, there are low return loss and high isolation better than − 29 and − 30 dB respectively. Meanwhile, the designed coupler has a good insertion loss and coupling factor. Despite of having a high performance, this coupler is relatively compact with an overall size of 0.037 λg2. The designing method is based on proposing an LC model of a basic microstrip cell and finding the effective parameters to obtain a high performance. In order to validate the designing method and simulation results, the presented coupler is fabricated and measured. There is a good agreement between the simulated and measured results.

Keywords

Microstrip Branch-line coupler Phase shift Isolation 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Electrical EngineeringKermanshah University of TechnologyKermanshahIran
  2. 2.Young Researchers and Elite Club, Kermanshah BranchIslamic Azad UniversityKermanshahIran

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