access icon free Miniaturised and radiation efficient implantable antenna using reactive impedance surface for biotelemetry

© The Institution of Engineering and Technology
Received 15/02/2019, Accepted 04/10/2019, Revised 07/09/2019, Published 15/10/2019

This study presents the realisation of reactive impedance surface (RIS) in an implantable environment to design a compact wideband antenna for biotelemetry communication. The antenna is designed to operate at 2.45 GHz industrial, scientific and medical (ISM) band using a one-layer skin model. The proposed mushroom-based circular RIS successively improves the impedance matching, gain, and bandwidth of the antenna. The improvement in −10 dB impedance bandwidth and gain is observed by 270 MHz and 7 dB, respectively. The overall volume of the antenna is compact and measured only 99.69 mm3. The peak specific absorption rate value of the loaded antenna is noted at 595 W/kg for input power of 1 W, while the radiation efficiency of the antenna is noted by 7.5% at the resonance. The fabricated prototype is inserted into the minced pork and dipped into a skin mimicking gel for the measurement purpose. Furthermore, the link margin has been analysed, which predicts a possible transmission range up to 40 m for a signal bit rate ≤5 Mbps. The impact of associated circuit components on the antenna performance has also been investigated.

Inspec keywords: biomedical telemetry; impedance matching; UHF antennas; skin; antenna radiation patterns; broadband antennas

Other keywords: one-layer skin model; implantable environment; bandwidth 270 MHz; power 1.0 W; radiation efficient implantable antenna; mushroom-based circular RIS; reactive impedance surface; associated circuit components; compact wideband antenna; efficiency 7.5 percent; frequency 2.45 GHz; impedance matching; measurement purpose; gain 7.0 dB; specific absorption rate; antenna performance; bit rate 5 Mbit/s; biotelemetry communication; miniaturised implantable antenna; ISM band; loaded antenna; skin mimicking gel

Subjects: Telemetry; Biomedical communication; Telemetering systems; Single antennas

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