Design of Ridge Gap Waveguide Slot Antenna Array for Millimeter Wave Radar

This paper presents a slot antenna array with three transmitting and four receiving based on ridge gap waveguide (RGW). The proposed antenna uses the structural characteristics of electromagnetic band gap (EBG) to solve the problems of high dielectric loss and limited gain of the traditional microstrip millimeter wave radar antenna. The simulation results show that the bandwidth of the proposed RGW slot receiving antenna array is about 2GHz and the operating band gain is more than 21dB. The bandwidth of RGW slot transmitting antenna array is about 2.64GHz while the operating band gain is more than 13dB. The proposed antenna has high radiation efficiency which is suitable for millimeter wave radar antenna application.