A 38-GHz Substrate Integrated Waveguide Cavity-Backed Tapered-Slot Antenna

Abstract

A compact substrate integrated waveguide (SIW) cavity-backed tapered-slot antenna is designed with an overall footprint of 23.9mm × 6.27mm\(2.99 λ0× 0.79 λ0), where λ0 is the free space wavelength at the lowest frequency of the antenna bandwidth (i.e. 37.57 GHz). The slot in the antenna geometry is excited with the TE104 mode for exhibiting radiation characteristic in the broadside direction. The 10-dB impedance bandwidth (S11 < -10dB) is obtained from 37.57 to 40.11 GHz (6.54%), with a minimum gain of 7.51 dBi over the entire bandwidth. The presence of the tapered slot has been investigated through surface current distributions and parametric variations. The proposed antenna has a simple topology, low profile, and can be considered as a promising candidate for 5G applications. © 2021 IEEE.