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Spiral slot antenna fed by coplanar waveguide using magnetic phase difference

✍ Scribed by Sungwu Park; Nam Kim; Seungyeop Rhee; Seungwoo Lee

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
323 KB
Volume
52
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

A new type of spiral slot antennas, using the magnetic flow in the slots for broadband and circular polarizations fed by a coplanar waveguide, is presented in this letter. Two spiral slots are operated as separate radiators. To reduce the magnetic cancellation between the two feeding lines, two spiral slots are fed by sources which are about 180Β° out‐of‐phase with each other so that this antenna does not need a balun circuit. The operating frequency range is enlarged by optimizing various parameters. As a result of measurement, the bandwidth of the proposed antenna is 2.7–12 GHz below the return loss of βˆ’10 dB, and the 3 dB bandwidth of the axial ratio is in the ranges 4.2–4.7 GHz and 5.9–6.8 GHz. Β© 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 28–30, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24821

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