Design of Substrate Integrated waveguide 8×8 Slot Array antenna at Ku band

In order to solve the problems of low radiation power of microstrip antenna and difficult integration of metal waveguide, substrate integrated waveguide (SIW) structure with the advantages of both microstrip and waveguide has attracted wide attention. Based on HFSS, an 8-element constant amplitude in-phase standing wave linear array operating at Ku-band with the center frequency of 18GHz is designed by using the side-feed mode. Then the 8×8 slot array antenna is designed by the wide side longitudinal slit of the SIW. The simulation results show that the gain of the array is 20.9dBi, the return loss is very small, the VSWR is less than 2 in 17.09~18.19GHz and 19.66~22 GHZ bands, and the relative bandwidth is about 59%.-10dB bandwidth is 17.18GHz-18.14GHz(16.6%). The resonant frequency of the input reflection coefficient is 18GHz, which is less than -20dB, and the antenna efficiency is high. The simulation results are good, which verifies the feasibility of the design. The designed antenna has high gain, strong directionality, easy integration and good impedance matching, which has a broad application prospect in microwave and millimeter wave systems.