Year: 2024
Type: article
Abstract: The classical scenario where a single-plane-wave field impinges a Dallenbach absorber is well studied both theoretically and experimentally. However, occasionally a spectrum of plane waves impinges the absorber. Such a scenario occurs, for example, if an antenna is located adjacent to the absorbing layer. In this paper, for this scenario we obtain the absorbing performance bound and design an optimized layered absorber that approaches the bound. In a numerical demonstration, we explore a realistic case where a dipole antenna is placed in the vicinity of a finite, electrically thin, Dallenbach absorber backed by a perfect-electric-conductor plane in the 6G frequency range. In the absence of the absorbing layer covering the perfect-electric-conductor plane, severe scattering from the plane distorts the radiated fields. These distortions are robustly mitigated by the specifically tailored optimal absorber to yield a more-desired radiation pattern. Additionally, we propose a metamaterial realization that emulates the required properties of the absorbing layer for all field polarizations.
Source: Physical Review Applied
Authors: Chen Firestein, Amir Shlivinski, Yakir Hadad
Institutions: Ben-Gurion University of the Negev, Tel Aviv University
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Award: G6513252985
OpenAlex ID: W4403486386