Abstract
A new design of a circularly polarized printed square-slot antenna loaded with a rectangular conducting patch is described. The rectangular patch is placed along one of the center lines of the square slot. With the selection of proper dimensions of the rectangular patch, two orthogonal resonant modes with a 90° phase difference for circular polarization (CP) can be excited by using a microstrip feed line oriented along the diagonals of the square slot. The proposed slot antenna has been implemented and experimentally studied. An impedance bandwidth of 39% (determined from 10 dB return loss) and a 3 dB CP bandwidth of 12% (defined by a 3 dB axial ratio) for the proposed antenna have been obtained. The gain variation for the frequencies within the CP bandwidth is also observed to be less than 1.3 dB. Details of the antenna design and experimental results are presented and discussed. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 23: 363–365, 1999.
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