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In this paper circularly polarized rectangular patch microstrip antenna is designed and its parameters are compared with another simple patch antenna without circular polarization. The impedance matching and radiation characteristics of this designed structure are studied. The presented antenna is based on coaxial feed with thin substrate and 1.75 GHz operating frequency. Two opposite corners of the patch are cut to allow two orthogonal polarisation modes of same magnitude and 90 degree phase shift to initiate circular polarization. The proposed antenna is suitable for various applications including wireless communication. A dual polarised antenna is also designed with better results than the simple patch antenna and circularly polarised antenna. The proposed antenna can be easily integrated with WLAN systems or point to multi point application.