Array of quasi-rhomboid antenna for ultra wideband applications

A novel single element and array prototype antennas are presented for ultra wideband applications. The regular dipole and bow-tie shape are modified to a quasi rhomboid shape. The proposed antenna is designed on FR4 substrate, since it is small size, easily fabricated and low manufacturing cost. In antenna design, we analyze and simulate this antenna structure by using IE3D program. In order to verify the simulation results, the proposed antenna is realized and experimentally examined. In measurement, it is found that both antennas have impedance bandwidth of 120.55 % and 117.58 % (2:1 VSWR) which covered ultra wideband spectrum range with average gain of 4 and 6 dB at center frequency for a single element and an array structure, respectively. This antenna has a return loss lower than -10 dB all over the operating frequency and omni-directional patterns in azimuth plane. The advantage of the proposed antenna is that it can be used to design impulse receive-transmit system of ultra wideband applications.