DRA gain enhancement using a planar metamaterial superstrate

摘要

This article analyzes the radiation principle of a slot-coupled hemispherical dielectricrnresonator antenna (DRA) integrated with a single-layer metamaterial (MTM)rnsuperstrate, investigating it both numerically and experimentally. It creates a compactrnhigh directive DRA incorporating MTM superstrate. The proposed MTMrnmedium consists of broadside coupled planar E-shaped resonator periodic unit cellrnexhibiting low loss and a low refractive index over a broad frequency band.rnMeasurements on fabricated prototypes to verify numerical results from full-wavernsimulations, and they show more than 6 dB increase in directivity of the DRA.