Design of a D-band SIW Slot Array Antenna

An 8-channel slot array antenna at D-band based on substrate integrated waveguide (SIW) is proposed and fabricated. The system is fed by a standard straight waveguide (WR7), and the energy is fed into the system through a SIW to rectangular waveguide (RWG) right-angle conversion structure. The 8channel SIW slot antenna array is uniformly fed by a SIW power distribution network, and the slot antenna array radiates the electromagnetic waves into the free space. The fabricated array antenna can achieve the measured $\left|S_{11}\right|\lt -10 \mathrm{~dB}$ from 116.6 to $\mathbf{1 2 5. 1} \mathrm{GHz}$, and measured gain of 20.2 dBi at 120 GHz. Meanwhile, the SIW transmission line with the same length as the antenna array system is designed and fabricated, and the measured transmission loss is $\mathbf{4 d B}$.