A Planar Wideband Unidirectional Open-Slot Antenna

A wideband open-slot antenna with unidirectional radiation property is proposed in this letter. A coplanar electric dipole is added to improve the radiation characteristics of the conventional open-slot antenna. Compared with adding cavity-backed structures, a simple and small size antenna is proposed with the size of 20×20 mm
²
by using this design method. The simulated and measured results show the proposed antenna has stable and unidirectional radiation pattern within entire operation frequencies from 5.88 to 10.52 GHz. In addition, the high front-to-back ratio and low cross polarization radiation performance are achieved. These properties make the proposed antenna more attractive for wireless communication and radar fields.