Wideband patch antenna for Q band application

A wideband shorted patch antenna is presented in this paper. The substrate integrated waveguide (SIW) is used to excite the proposed patch antenna, and three metallic posts are introduced to connect the patch and the ground. Trough introducing the metallic posts, a wideband property is achieved. The 3-dB gain bandwidth is 22.2% from 40 GHz to 50 GHz, and the return loss is all bellow -10 dB within the 3-dB gain bandwidth. In order to promote the radiation pattern and gain, a differential - fed 1*2 antenna array is studied.