Mitra, Srinjoy

Mugisha, Andrew

Podilchak, Symon

Rigi, Amin

English

We present a sub-GHz, low profile Electrically Small Antenna (ESA), designed for UHF RFID miniaturised battery free Implantable Wireless Medical Devices (IWMDs). The custom ESA is a linearly polarised dipole, and its topology leverages a meanderline structure to miniaturise its form factor. Furthermore, the ESA utilises a receded ground plane to improve its gain performance and achieve resonance, at the desired sub-GHz design frequency of 915 MHz. The ESA's dipole characteristics provide an added benefit of 180° bi-directional RF signal propagation. The ESA's design was optimised to integrate the footprint of a UHF RFID sensor chip (SL900A). By integrating the UHF RFID chip on the ESA, a complete wireless battery free sensory medical device, with an integrated antenna, can be realised. The antenna has a formfactor of 12.75× 12.25× 0.29 mm3. A prototype of the proposed ESA was fabricated and encapsulated in Polydimethylsiloxane (PDMS). Measurements of the prototyped ESA's input reflection coefficient (S11) and farfield gain values, at 915 MHz, were -26.44 dB and -18.88 dBi, respectively and demonstrated significantly better gain and efficiency performance, when compared to peer reviewed work. The ESA can be used as an antenna for various battery-free subcutaneous implants with a connected sensor (e.g., temperature) or actuator (e.g., neurostimulator).</p

Tsiamis, Andreas

Edinburgh Research Explorer

Electrically Small Antenna For RFID-based Implantable Medical Sensor

https://www.research.ed.ac.uk/files/336341404/Electrically_Small_Antenna_For_RFID_based_Implantable_Medical_Sensor.pdf

Electrically Small Antenna For RFID-based Implantable Medical Sensor

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