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

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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.

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Authors and Affiliations

  1. Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah, Iran

    A. Rezaei & S. M. Hosseini

  2. Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

    L. Noori

Authors
  1. A. Rezaei
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  2. L. Noori
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  3. S. M. Hosseini
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Correspondence to L. Noori.

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Rezaei, A., Noori, L. & Hosseini, S.M. Novel microstrip branch-line coupler with low phase shift for WLANs. Analog Integr Circ Sig Process 98, 377–383 (2019). https://doi.org/10.1007/s10470-018-1255-9

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  • DOI: https://doi.org/10.1007/s10470-018-1255-9

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