A Simple Beamforming Technique for Intelligent Reflecting Surfaces in 5G Scenarios

Abstract

This contribution proposes a simple closed-form formula to compute the phase-shift distribution on Intelligent Reflecting Surfaces (IRS), which can be implemented using metasurfaces or reflectarray panels. The proposed technique is based on introducing a quadratic phase correction to the phase distribution that generates a collimated beam. The phase correction allows to independently control the half-power beamwidth (HPBW) in azimuth and elevation for low-cost passive IRS panels. The capabilities of the technique have been demonstrated by computing the phase distribution and radiation patterns of a 40 cm × 40 cm IRS that redirects the beam in azimuth and elevation and broadens the beam from 2º to 4º in elevation and from 2º to 18º in azimuth. This technique is very useful to the design of low-cost passive IRS panels.