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http://dx.doi.org/10.5515/KJKIEES.2009.20.2.208

Self-Complementary Spiral Antenna Design Using a Ultra-Wideband Microstrip-to-CPS Balun  

Woo, Dong-Sik (School of Electrical Engineering and Computer Science, Kyungpook National University)
Kim, Young-Gon (School of Electrical Engineering and Computer Science, Kyungpook National University)
Cho, Young-Ki (School of Electrical Engineering and Computer Science, Kyungpook National University)
Kim, Kang-Wook (School of Electrical Engineering and Computer Science, Kyungpook National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.20, no.2, 2009 , pp. 208-214 More about this Journal
Abstract
A design and its experimental result of a wideband self-complementary spiral antenna for UWB USPR(Ultrashort-Pulse Radar) system applications is presented. By utilizing the planar-type ultra-wideband microstrip-to-CPS balun, ultra-wideband characteristics of the inherent spiral antenna are retrieved. Also, the design procedure of the spiral antenna is simplified by performing simple impedance matching between separately designed balun and antenna. The proposed spiral antenna is equiangular self-complementary spiral antenna. The implemented antenna demonstrates widebaad performance for frequency ranges from 2.9 to 12 GHz with the relatively flat antenna gain of 2.7 to 5.3 dB and broad beamwidth of more than $70^{\circ}$. From these result, the possibility of a spiral antenna using a ultra-wideband microstrip-CPS balun is verified.
Keywords
Spiral Antenna; Self-Complementary; Balun; Coplanar Stripline(CPS); Ultrashort-Pulse Radar(USPR);
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