Broadband SIW Slot Antenna for Millimeter Wave Application

In this paper, a wideband SIW slot antenna for millimeter frequency band is designed. The method of etching irregular rectangular grooves on the top of the integrated waveguide of the substrate and loading short-circuit pins realizes the broadband of the antenna and improves the gain of the antenna. Grounded coplanar waveguide(GCPW) feeding to obtain better matching; the working frequency band of the antenna is 20-26.8GHz, the relative bandwidth is 28.3%, and the antenna gain is 10.1dB. For the traditional slot antenna, the slot antenna based on the substrate integrated waveguide(SIW) designed in this paper has a wider impedance bandwidth and can be used in millimeter wave communications.