Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Design of an extremely miniaturized planar ring hybrid

  • Kang, In Ho (Department of Radio Engineering Korea Maritime and Ocean University) ;
  • Sun, Shu Zhong (Department of Radio Engineering Korea Maritime and Ocean University)
  • Received : 2013.07.02
  • Accepted : 2013.09.04
  • Published : 2013.11.30
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Abstract

This paper presents a method for analyzing and designing an extremely miniaturized planar ring hybrid, using the combination of parallel and diagonally shorted coupled lines. In contrast to conventional miniaturized coupled line filters, it is proven that the required electrical length of transmission line can be largely reduced to even a few degrees, not only effectively suppressing the spurious passband but also approximately maintaining the same characteristic around the stable center frequency. A ring hybrid filter at center frequency of 1 GHz was fabricated on the FR4 epoxy glass cloth copper-clad plat (CCL) PCB substrate. The insertion loss of a ring hybrid filter with the die area of $30mm{\times}30mm$ is -4.68 dB. Simulated results are well agreed with the measurements.

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References

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