KIEE International Transactions on Electrophysics and Applications

The Korean Institute of Electrical Engineers (대한전기학회)
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A Study on the Tapered Balun for the UWB UHF Coupler

  • Park, Jae-Gu (Power Facility Diagnosis Research Group, KERI) ;
  • Yi, Sang-Hwa (Power Facility Diagnosis Research Group, KERI) ;
  • Kim, Kwang-Hwa (Power Facility Diagnosis Research Group, KERI) ;
  • Rhee, Young-Chul (Department of Information and Communication Engineering, Kyungnam University)
  • Published : 2003.12.01
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Abstract

The UWB UHF coupler for GIS PD detection requires a balun (balance to unbalance transformer) to show its inherent UWB characteristics. In order to reduce the size of the balun and to make it practical in the conventional GIS, a novel tapered coaxial balun with a dielectric was proposed for the UWB UHF coupler. The performance of the proposed balun was verified through a series of simulations, measurements and experiments. As a result, both the conventional balun and the proposed balun, which has a length equal to one third of that of the conventional balun, demonstrated good S11 characteristics, whereas the efficiency of the proposed balun increased as much as about 30% in comparison to the conventional one.

Keywords

References

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