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A modified ultra-wideband (UWB) printed rectangular antenna fed by a microstrip line is proposed. Overall dimension of the antenna is as compact as 14 × 14 × 1 mm where λ is the wavelength of the first resonance of the antenna. The main features of the proposed antenna are its compact size and its filtering characteristic over WLAN band. Through adjusting the dimensions of the elements of the antenna, notch frequency in different ranges of the UWB can be obtained. The resulting VSWR<1.5 impedance bandwidth is between 3.6-9.6GHz. Antenna presents a stable gain and omnidirectional radiation pattern in its operational frequencies.

COMPACT UWB ANTENNA WITH INVERTED HAT SHAPED RESONATOR AND SHORTENING VIA PINS FOR FILTERING PROPERTIES