DESIGN OF A CORNER-TRUNCATED SQUARE-SPIRAL MICROSTRIP PATCH ANTENNA IN THE 5-GHz BAND

摘要

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.