Design of Rectangular Waveguide-fed Metasurfaces for Near-Field Shaping using a Coupled Dipole Model

TL;DR

This paper introduces a coupled dipole model-based design method for rectangular waveguide-fed metasurfaces, enabling precise near-field shaping through electromagnetic control of subwavelength radiators, validated by simulations and experiments.

Contribution

It develops a coupled dipole framework for designing waveguide-fed metasurfaces, allowing accurate near-field pattern control with mutual element interactions considered.

Findings

Effective near-field shaping demonstrated in simulations

Validation through X-band experiments confirms model accuracy

Design approach improves electromagnetic field control

Abstract

We present the design of rectangular waveguide-excited metasurfaces for near-field shaping using a coupled dipole framework. Waveguide-fed metasurfaces are array-like radiating systems typically constructed from one or more waveguides loaded with a series of subwavelength metamaterial apertures that function as radiators. The use of subwavelength radiating elements distributed across the aperture enables electromagnetic field control with subwavelength precision, offering significant potential for near-field shaping. Leveraging these capabilities, we demonstrate that the near-field patterns of rectangular waveguide-fed metasurfaces can be tailored using the coupled dipole model, which accounts for mutual interactions between metamaterial radiating elements. The validity and effectiveness of the proposed approach are verified through full-wave simulations and experiments in the X-band.