Chiral-field microwave antennas (Chiral microwave near fields for far-field radiation)

TL;DR

This paper demonstrates how chiral microwave near fields generated by a ferrite disk can produce a radiation pattern with a squint, leveraging topological properties for unique phase control in far-field radiation.

Contribution

It introduces a novel single-element antenna design utilizing magnetostatic-mode ferrite disks to achieve chiral near fields and controlled radiation patterns.

Findings

Radiation pattern with squint achieved using chiral near fields

Strong subwavelength energy localization at magnetostatic resonances

Unique topological properties of magnetostatic oscillations identified

Abstract

In a single-element structure we obtain a radiation pattern with a squint due to chiral microwave near fields originated from a magnetostatic-mode ferrite disk. At the magnetostatic resonances, one has strong subwavelength localization of energy of microwave radiation. Magnetostatic oscillations in a thin ferrite disk are characterized by unique topological properties: the Poynting-vector vortices and the field helicity. The chiral-topology near fields allow obtaining unique phase structure distribution for far-field microwave radiation.