Spade-Shaped Patch Antenna for Ultra Wideband Wireless Communication Systems

In recent years many studies are concentrated on UWB microstrip antenna structures for important purposes in wireless communication systems, medical imaging, and radar sensor resolution. In this paper, we printed a spade-shaped radiator patch on nearly rectangular substrate of (30 x 28mm) made of Taconic TLY-5 material. The relative dielectric constant was 2.2, and the thickness of the material was 1.575mm. The patch was fed by a transmission line feeder, and there was a gap between the patch and the ground plane. The computer simulation test (CST) microwave studio software was used in the simulation, and anechoic chamber with a network analyzer was used during the experimental tests. The simulated and measured results demonstrated that the proposed antenna achieved a wide impedance bandwidth from 3.7 GHz to 12 GHz with a return loss of less than -10 dB with a feed gap of 1 mm. The simulated and measured radiation patterns were maintained to be nearly omni-directional radiation characteristics.