Abstract
In this paper, the characteristics of the square-spiral antenna for broadband impedance bandwidth are investigated in the 5-GHz band. The design is based on the 1.25-turn square spiral antenna in a finite-sized ground with coaxial SMA feeding. Likewise, the corner of the proposed antenna is truncated so as to ensure smooth current flow. As a result, sufficient impedance bandwidth is obtained (VSWR < 2). The corner-truncated square-spiral microstrip patch antenna is able to achieve an impedance bandwidth of about 1.2 GHz or 20.9%, given a VSWR of less than 2. The radiation patterns are broad across the pass band, with gain measuring 2.8–7.3 dBi. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 529–532, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21399
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