In this paper, we propose a design of Circular Microstrip Patch Antenna (CMPA) with a rectangular slot etched ground plane as DGS. The defected ground structure concept is used to improve the bandwidth, impedance matching and the relocation of resonant frequency to make the compact CMPA. The size reduction of about 12 % compared to the actual area required to resonate at 5.6GHz. The bandwidth 270MHz with respect to center frequency 5.595GHz which covers wireless bands such as HiperLAN/2 band. The percentage bandwidth of 4.82 % and the average gain of 4.5dBi is achieved
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