Artificial magnetic conductor backed dual-mode sectoral cylindrical DRA for off-body biomedical telemetry

TL;DR

This paper presents a compact dual-mode sectoral cylindrical dielectric resonator antenna with an AMC surface, achieving wide bandwidth and low SAR for off-body biomedical telemetry applications.

Contribution

It introduces a size-reduced sectoral CDRA with dual-mode operation and AMC backing, enhancing bandwidth and SAR performance for wearable biomedical devices.

Findings

Bandwidth of 0.7 GHz (5.2-5.9 GHz) achieved

Peak gain of 7.9 dBi measured

SAR of 1.24 W/kg on human arm

Abstract

This research investigates the potential of a sectoral Cylindrical Dielectric Resonator Antenna (CDRA) for biomedical telemetry. CDRAs are known for their low loss, ruggedness, and stability, but their limited bandwidth and size make them unsuitable for wearable devices. The research addresses these limitations by proposing a dual mode antenna that operates in EH110 and TE210 modes. The sectoral CDRA is a quarter segment with Perfect Electric Conductor boundaries, reducing its size by a factor of four. Mathematical derivations of the field components for both modes are derived to support the design. To minimize specific absorption rate (SAR), an Artificial Magnetic Conductor (AMC) surface is applied to the antennas backside, enhancing compatibility with the transverse electric modes. The antenna achieves a bandwidth of 0.7 GHz (5.2-5.9 GHz), suitable for biomedical applications, with a measured peak gain of 7.9 dBi and a SAR of 1.24 W/kg when applied to a human arm.