Degrees of Freedom for Radiating Systems
Abstract
Electromagnetic degrees of freedom are instrumental in antenna design, wireless communications, imaging, and scattering. Larger number of degrees of freedom enhances control in antenna design, influencing radiation patterns and directivity, while in communication systems, it links to spatial channels for increased data rates and reliability, and resolution in imaging. The correlation between computed degrees of freedom and physical quantities is not fully understood, prompting a comparison between classical estimates, Weyl's law, modal expansions, and optimization techniques. In this paper, it is shown that the number of degrees of freedom for arbitrary shaped radiating structures approaches the shadow area measured in squared wavelengths asymptotically as the wavelength decreases.
Keywords
Cite
@article{arxiv.2404.08976,
title = {Degrees of Freedom for Radiating Systems},
author = {Mats Gustafsson},
journal= {arXiv preprint arXiv:2404.08976},
year = {2025}
}