This paper brings forward a small printed rectangular slit ultra-wideband microstrip antenna loaded with a plane of circular patch. Different from the common circular slit microstrip antennae, the circular patch is loaded in the middle of the rectangular slit in order to obtain ultra-wideband characteristics and maintain small physical size at the same time. Experimental results show that the impedance of the antenna bandwidth is 2.7 GHz ～ 6.2 GHz, the width of the lobe level of ±30 degrees, and the pitch beamwidth is ±20 degrees. And the physical size of the antenna is only 75 mm (length) × 70 mm (width) × 7 mm (thickness), which is suitable for ultra-wideband wireless communication system.
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