Low-cost wideband double-layer microstrip coupled-line directional coupler with high directivity

Kazemi Esfeh, Babak;Raskin, Jean-Pierre;Van Moer, Wendy
(2014) Microwave & Optical Technology Letters — Vol. 56, n° 7, p. 1570-1575 (2014)

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Authors
  • Kazemi Esfeh, BabakUCLouvain
    Author
  • Raskin, Jean-PierreUCLouvain
    Author
  • Van Moer, WendyFaculty of Engineering, Department of Fundamental Electricity and Instrumentation, University of Gävle (HIG), Gävle, Sweden
    Author
Abstract
In this article, a low-cost double-layer microstrip structure with a gap space between the two substrate layers is used to develop a microstrip coupled-line directional coupler with high directivity. The proposed design shows a high directivity (more than 20 dB) over a wide frequency bandwidth (more than 2 GHz). The double-layer directional coupler, designed on FR4 substrate material at 2.4 GHz provides more than 30 dB isolation. The simulation and measurement results are in good agreement. By applying a simple and low-cost fabrication process and design, the directivity of the directional coupler is enhanced by more than 10 dB compared with a microstrip structure. Copyright © 2014 Wiley Periodicals, Inc.
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Kazemi Esfeh, B., Raskin, J.-P., & Van Moer, W. (2014). Low-cost wideband double-layer microstrip coupled-line directional coupler with high directivity. Microwave & Optical Technology Letters, 56(7), 1570-1575. https://doi.org/10.1002/mop.28391 (Original work published 2014)