Control of Radiation Direction in an Aperture Array Excited by a Waveguide 2-Plane Hybrid Coupler

Abstract

This paper details the design of a plate that controls the beam direction in an aperture array excited by a waveguide 2-plane hybrid coupler. The beam direction can be controlled in the range of ±15–32 deg. in the quasi H-plane, and ±26–54 deg. in the quasi E-plane at the design frequency of 66.425 GHz. Inductive irises are introduced into tapered waveguides in the plate and the reflection is suppressed by narrow apertures. A plate that has a larger tilt angle in the quasi E-plane and another plate with conventional rectangular waveguide ports as a reference are fabricated and measured. The measured values agree well with the simulation results.