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Abstract
The rectangular patch antenna is designed with a compactable size of 21×19×1.6 mm3 for UWB applications. To achieve tri-band operating frequency the original rectangular radiation patch is modified by cutting a ring slot at the centre of the original patch and additional slots are made both from inside and from outside of the original rectangular patch diametrically . The proposed antenna observed with good directivity characteristics The analysed results are observed with three different frequencies 4.14GHz,6.5GHz and 11.45GHz with bandwidth of 7.31GHz and return loss is below 2 for all resonating frequencies with good radiation because of above characteristics and simplicity of the design.