In this paper, a compact, easy to fabricate single-feed multiple slotted square patch antenna is proposed to obtain dual-band Circular Polarization (CP) radiation patterns. To obtain dual operation, four T-shaped slits are inserted at the patch edges. Also, for CP operation in both bands, a rectangular slot is placed at the center of the patch. A small probe located at the diagonal square excites the patch. Simulation and measurement results including reflection coefficient, radiation patterns and Axial Ratio (AR) are presented. A patch size reduction as large as 32% is obtained. Measured results show that -10 dB bandwidths of reflection coefficient for lower-band and higher-band are 71 MHz and 299 MHz respectively. Also, AR bandwidths are 13 MHz and 15 MHz for lower and higher bands. The introduced antenna is successfully designed and fabricated and the measured results are in a very good agreement with those obtained by numerical investigation.

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