A Pattern Reconfigurable Antenna Featuring Large Tilted Angle for 5G Applications

A novel pattern reconfigurable antenna based on quasi-Yagi principle is proposed in this paper. The proposed antenna consists of four arc-shaped radiators, a parasitic patch and a pair of reconfigurable feeding networks. By switching the operating states of four PIN diodes in the feeding network, the surface current distribution of four arc-shaped radiators can be controlled respectively. In such way, the pattern reconfigurable characteristic is obtained. To further improve the antenna gain, a parasitic patch is added. Moreover, based on the Yagi operating principle, the parasitic patch acts as the director, which greatly increases the antenna tilted angle. The simulation results show that the antenna gain is 3.77dBi-4.29dBi and the tilted angle is increased from 50° to around 70°. Moreover, eight radiation modes with different beam directions and good impedance matching from 2.4 GHz to 2.5 GHz are achieved, which is suitable for 5G indoor applications.