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J Electromagn Eng Sci > Volume 13(1); 2013 > Article
Journal of Electromagnetic Engineering and Science 2013;13(1):22-27.
DOI: https://doi.org/10.5515/JKIEES.2013.13.1.22   
Wideband Double Dipole Quasi-Yagi Antenna Using a Microstrip-to-Slotline Transition Feed
Son Xuat Ta, Ikmo Park
School of Electrical and Computer Engineering, Ajou University
Abstract
This paper describes a wideband double dipole quasi-Yagi antenna fed by a microstrip-to-slotline transition. The transition feed consists of a microstrip radial stub and a slot radial stub, each with the same angle of $90^{circ}$ but with different radii, to achieve wideband impedance matching. Double dipoles with different lengths are utilized as primary radiation elements to enhance bandwidth and achieve stable radiation patterns. The proposed antenna has a measured bandwidth of 3.34~8.72 GHz for a -10 dB reflection coefficient and a flat gain of $6.9{pm}0.6$ dBi across the bandwidth.
Key words: Slotline Transition, Double Dipole, Tapered Coplanar Stripline

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