A planar substrate integrated waveguide slot-fed microstrip grid array antenna for the frequency range 76-81 GHz is presented. The antenna is realized on a standard soft RF substrate. It is fed using a transverse slot in a substrate integrated waveguide on a separate substrate layer below the antenna. A wideband microstrip to substrate integrated waveguide is designed to feed the antenna. Measurement results show a 12% S11<-10 dB bandwidth.
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