# A Flexible Design for Beam Squint Effect Suppression in IRS-Aided THz Communications

## TL;DR

This paper proposes a novel method using movable components on both the base station and IRS in wideband THz systems to effectively suppress the double beam squint effect, improving signal power across the spectrum.

## Contribution

It introduces a new optimization framework employing movable antenna arrays and IRS subarrays to mitigate beam squint in wideband THz communications.

## Key findings

- The proposed algorithm effectively suppresses beam squint.
- Movable components significantly improve received power.
- Numerical results confirm the method's effectiveness.

## Abstract

In this paper, we study employing movable components on both base station (BS) and intelligent reflecting surface (IRS) in a wideband terahertz (THz) multiple-input-single-output (MISO) system, where the BS is equipped with a movable antenna (MA) array and the IRS consists of movable subarrays. To alleviate double beam squint effect caused by the coupling of beam squint at the BS and IRS, we propose to maximize the minimal received power across a wide THz spectrum by delicately configuring the positions of MAs and IRS subarrays, which is highly challenging. By adopting majorization-minimization (MM) methodology, we develop an algorithm to tackle the aforementioned optimization. Numerical results demonstrate the effectiveness of our proposed algorithm and the benefit of utilizing movable components on the BS and IRS to mitigate double beam squint effect in wideband THz communications.