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J Electromagn Eng Sci > Volume 11(3); 2011 > Article
Journal of the Korean Institute of Electromagnetic and Science 2011;11(3):227-234.
DOI: https://doi.org/10.5515/JKIEES.2011.11.3.227   
Design of Broadband Quasi-Yagi Antenna Using a Folded Dipole Driver
Son Xuat Ta1, Byoung-Chul Kim1, Ho-Sung Choo2, Ik-Mo Park1
1School of Electrical and Computer Engineering, Ajou University
2School of Electronic and Electrical Engineering, Hongik University
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.
Key words: Broadband, Quasi-Yagi Antenna, Folded-Dipole.

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