Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Dual-Polarized Annular Ring Patch Antenna for 2.4 GHz Doppler Radar

  • Kim, Seong-Ho (Department of Electronics and Communications Engineering, Hanyang University) ;
  • Yook, Jong-Gwan (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Cho, Sung-Ho (Department of Electronics and Communications Engineering, Hanyang University) ;
  • Jang, Byung-Jun (Department of Electronics Engineering, Kookmin University)
  • Received : 2010.04.14
  • Published : 2010.09.30
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Abstract

A 2.4 GHz dual-polarized antenna for a Doppler radar is studied. The proposed dual-polarized antenna using a stacked annular ring patch with two co-centric gap-coupled feed lines and a $90^{\circ}$ hybrid exhibits fairly good performance of 22 dB isolation at a center frequency of 2.4 GHz. Using a $90^{\circ}$ hybrid, a right-handed circular polarization for the transmitter and a left-handed circular polarization for the receiver are implemented. The gain of the designed antenna is about 0 dBi over operating frequencies. The antenna size including a ground plane is only $40{\times}40\;mm^2$.

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References

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