Finger-Ring Dielectric Resonator Antenna for Millimeter-Wave Applications

Abstract

A mm-wave circularly polarized (CP) dielectric resonator antenna (DRA) for finger-worn applications is proposed, designed, and simulated. The proposed DRA utilizes a conformal configuration and operates within the 20–30 GHz frequency range. A cylindrical substrate supports a dielectric resonator with a relative permittivity. The antenna dimensions are 6 mm and 3.4 mm, with a conformal ground plane of 20 mm and 10 mm. The finger-ring DRA is tested in both free space and on-body situations. In on-body, the impedance bandwidth drops from 20% in free space to 15%, and the CP bandwidth drops from 12% to 3.5%. The off-body configuration achieves a peak gain of approximately 8 dBi, which decreases by approximately 1 dB in the on-body case. The radiation patterns and axial ratio demonstrate the suitability of the design for wearable applications. A comparative analysis with existing literature highlights the advantages of the proposed DRA in terms of bandwidth, gain, and polarization characteristics.