A broadband directional slot aperture antenna fed by electromagnetic coupling from the triplate line was developed in the millimeter-wave band. The slot aperture is opened on the top of the double-layer substrate with conductor patterns on its both sides, which results in low profile. The broad bandwidth was achieved by applying the principle of a broadband microstrip-to-waveguide transition. The geometrical parameters of the antenna was optimized by using electromagnetic analysis of the finite element method in the millimeter-wave band. The performance of the developed antenna was evaluated by simulation. The bandwidth of S11 less than 10 dB was 24.2 GHz from 71.5 to 95.7 GHz. The gain was higher than 6 dBi in the bandwidth.
（英）
A broadband directional slot aperture antenna fed by electromagnetic coupling from the triplate line was developed in the millimeter-wave band. The slot aperture is opened on the top of the double-layer substrate with conductor patterns on its both sides, which results in low profile. The broad bandwidth was achieved by applying the principle of a broadband microstrip-to-waveguide transition. The geometrical parameters of the antenna was optimized by using electromagnetic analysis of the finite element method in the millimeter-wave band. The performance of the developed antenna was evaluated by simulation. The bandwidth of S11 less than 10 dB was 24.2 GHz from 71.5 to 95.7 GHz. The gain was higher than 6 dBi in the bandwidth.