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 J Electromagn Eng Sci > Volume 10(3); 2010 > Article
 Journal of the Korean Institute of Electromagnetic and Science 2010;10(3):183-185. DOI: https://doi.org/10.5515/JKIEES.2010.10.3.183
 Dual-Polarized Annular Ring Patch Antenna for 2.4 GHz Doppler Radar Seong-Ho Kim1, Jong-Gwan Yook2, Sung-Ho Cho1, Byung-Jun Jang3 1Department of Electronics and Communications Engineering, Hanyang University2Department of Electrical and Electronic Engineering, Yonsei University3Department of Electronics Engineering, Kookmin University 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 $40{times}40;mm^2$. Key words: Doppler Radar, 2.4 GHz, Dual-Polarized, Hybrid, Isolation, Annular Ring, Microstrip Antenna

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