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http://dx.doi.org/10.5515/KJKIEES.2013.24.1.27

Design of Compact and Broadband Quasi-Yagi Antenna Using Balance Analysis of the Balun  

Woo, Dong Sik (School of Electronics Engineering, College of IT Engineering, Kyoungpook National University)
Kim, In-Bok (School of Electronics Engineering, College of IT Engineering, Kyoungpook National University)
Kim, Young-Gon (School of Electronics Engineering, College of IT Engineering, Kyoungpook National University)
Kim, Kang Wook (School of Electronics Engineering, College of IT Engineering, Kyoungpook National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.24, no.1, 2013 , pp. 27-35 More about this Journal
Abstract
In this paper, a compact, broadband quasi-Yagi antenna utilizing balance analysis of the ultra-wideband microstrip-to-coplanar stripline(MS-to-CPS) balun is proposed. The antenna size was reduced by removing the reflector on bottom layer and ground plane is used as a reflector. A planar balun that transforms from microstrip(MS) to balanced coplanar stripline(CPS) is characterized in the amplitude and phase imbalances at CPS output ports are investigated and discussed. As compared with the conventional balun, the proposed MS-to-CPS balun demonstrated very wideband performance from 7 to over 20 GHz. From the simulation study, amplitude and phase imbalances are within 1 dB and ${\pm}5^{\circ}$, respectively. The implemented antenna provides very wide bandwidth from 6.9 to 15.1 GHz(74.5 %). The gain of the antenna is from 3.7 to 5.5 dBi, the front-to-back ratio is more than 10 dB, and the nominal radiation efficiency is about 94 %.
Keywords
Microstrip Antenna; Coplanar Stripline(CPS); Broadband Antenna; Balun; Balance Analysis;
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