Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Design of Broadband Quasi-Yagi Antenna Using a Folded Dipole Driver

  • Ta, Son Xuat (School of Electrical and Computer Engineering, Ajou University) ;
  • Kim, Byoung-Chul (School of Electrical and Computer Engineering, Ajou University) ;
  • Choo, Ho-Sung (School of Electronic and Electrical Engineering, Hongik University) ;
  • Park, Ik-Mo (School of Electrical and Computer Engineering, Ajou University)
  • Received : 2011.05.27
  • Published : 2011.09.30
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Abstract

This paper describes the development of a broadband quasi-Yagi antenna using a folded dipole driver. The antenna is designed on a low-permittivity substrate to reduce the surface wave effect, and hence the gain can be enhanced easily by adding directors. The folded dipole driver is connected to a 50-${\Omega}$ microstripline via a simple broadband microstrip-to-coplanar stripline transition with a quarter radial stub. The key motivation for the use of a folded dipole is to increase the input impedance at the driver, allowing a smaller mismatch loss between the antenna driver and the coplanar stripline feed. The proposed antenna has a measured bandwidth of 4.67~6.26 GHz for the -10 dB reflection coefficient, and a flat gain of 4.86~5.15 dB within the bandwidth.

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References

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