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A compact rectangular dielectric resonator antenna (DRA) is presented for ultra wide band communication systems. Ansoft HFSS 3-D electromagnetic solver is used for the design optimization. The proposed antenna has a low profile (~3), a small size and a low permittivity constant (10.2). An impedance bandwidth about 46% (from 6.9 to 11 GHz) was achieved making this antenna suitable for DS-UWB high band (i.e. 6 to 10.1 GHz) applications.