A 60 GHz SIW-based Vivaldi antenna with improved radiation patterns

A 60 GHz substrate integrated waveguide (SIW)-based Vivaldi antenna with low cross-polarization and side lobe levels is presented. The feed system is implemented using microstrip-to-SIW transition, SIW, and SIW-to-slot-line transition. The simulated and measured results show a nearly flat gain of 15 ±0.4 dB over the frequency range of 55-65 GHz. In addition, a good impedance matching and symmetric radiation pattern is observed over the band of interest. A good agreement between Ansys HFSS and measured results is obtained. The proposed antenna is suitable for high data rate wireless applications.