Work

Planar Toroidal Microwave Meta-Atom Coupled With the Microstrip Line

Year: 2026

Type: article

Abstract: This letter presents a method for coupling a single cell of a metamaterial (meta-atom) to a microstrip excitation line, which enables such meta-atoms to be used for creating metamaterials with specified resonance characteristics. The meta-atom exhibits an anapole toroidal resonance. It makes possible to reduce radiation losses without using a metal ground plate on the reverse side of the substrate. A reduced concentration of electric field in the dielectric is achieved, indirectly decreasing dielectric losses in the substrate of the structure. For experimental confirmation, samples were fabricated on a FR4 laminate substrate. Internal$Q$-factor of the resonator to a value of 140 at a frequency of 3 GHz was achieved, which is associated with the anapole resonance mode formation. This method can be used to develop resonators of record-level characteristics.

Source: IEEE Microwave and Wireless Technology Letters

DOI: 10.1109/lmwt.2026.3725354