Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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A Compact Wideband Crossover Coupler with Lumped Elements

  • Kwangwon Park (School of Electrical Engineering, Korea University) ;
  • Hyunkyu Lee (School of Electrical Engineering, Korea University) ;
  • Iljin Lee (School of Electrical Engineering, Korea University) ;
  • In-Woong Kang (Agency for Defense Development) ;
  • Sanggeun Jeon (School of Electrical Engineering, Korea University)
  • Received : 2018.09.16
  • Accepted : 2018.12.08
  • Published : 2019.04.30
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Abstract

A compact wideband crossover coupler with fully lumped elements is presented. To achieve a wideband operation, a three-section branch-line structure is employed for the crossover coupler. The size is significantly minimized by replacing transmission lines with lumped elements. The measurement shows that the insertion loss, isolation, and return loss are 1.7 dB, 24 dB, and 14.5 dB, respectively, at 2 GHz. The fractional bandwidth of 20-dB isolation and 3-dB insertion loss is 27%. The size of the crossover coupler is 11 mm × 9 mm, which corresponds to 0.07λ × 0.06λ at 2 GHz. This is significantly smaller than a conventional three-section branch-line crossover coupler by 95%.

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Acknowledgement

This research was supported by the Agency for Defense Development.