Dual-Polarized Annular Ring Patch Antenna for 2.4 GHz Doppler Radar

Kim, Seong-Ho; Yook, Jong-Gwan; Cho, Sung-Ho; Jang, Byung-Jun

doi:2010.10.3.183

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 University
²Department of Electrical and Electronic Engineering, Yonsei University
³Department 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