Intelligent reflecting surface-aided wideband THz communications: modeling and analysis

Konstantinos Dovelos, Stylianos D. Assimonis, Hien Quoc Ngo, Boris Bellalta, Michail Matthaiou

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this paper, we study the performance of wideband terahertz (THz) communications assisted by an intelligent reflecting surface (IRS). Specifically, we first introduce a generalized channel model that is suitable for electrically large THz IRSs operating in the near-field. Unlike prior works, our channel model takes into account the spherical wavefront of the emitted electromagnetic waves and the spatial-wideband effect. We next show that conventional frequency-flat beamfocusing significantly reduces the power gain due to beam squint, and hence is highly suboptimal. More importantly, we analytically characterize this reduction when the spacing between adjacent reflecting elements is negligible, i.e., holographic reflecting surfaces. Numerical results corroborate our analysis and provide important insights into the design of future IRS-aided THz systems.

Original languageEnglish
Title of host publicationProceedings of the 25th International ITG Workshop on Smart Antennas, WSA 2021
Number of pages5
ISBN (Electronic)9783800756889
Publication statusPublished - 22 Mar 2021
Event25th International ITG Workshop on Smart Antennas 2021 - French Riviera, France
Duration: 10 Nov 202112 Nov 2021


Conference25th International ITG Workshop on Smart Antennas 2021
Abbreviated titleWSA 2021
CityFrench Riviera


  • Beam squint
  • Beamfocusing
  • Intelligent reflecting surfaces
  • Near-field
  • Wideband THz communications

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Instrumentation


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