A Planar W-Band Large-Scale High-Gain Substrate-Integrated Waveguide Slot Array

A W-band large-scale substrate-integrated waveguide (SIW) cavity-backed slot array for high-gain applications is presented in this communication. The proposed antenna consists of a compact 16-way power divider and a 32 × 33 slot array. The 16-way power divider at the bottom-layer PCB provides equal-amplitude and alternative-phase excitation for 32 SIWs on the top layer PCB, and each of them supports 33 radiation slots. The loss along with the complexity of the feeding network is reduced by the implementation of alternative-phase excitation. To demonstrate the proposed slot array, a 4 × 33 slot array excited by a two-way power divider is designed first. Then, the 4 × 33 slot array is extended to a 32 × 33 slot array by a 16-way power divider. To verify the proposed slot array, the designed array is fabricated and measured. The measured peak gain, radiation, and aperture efficiencies are 30.88 dBi, 42%, and 22.8% at 93.2 GHz, respectively. The proposed high-gain antenna is an excellent candidate for the high-frequency millimeter-wave (mm-wave) wireless system.