Magnetic conformal antennas for in-body, implantable and underwater communications (2017)

It has been shown that channel capacity of an in-vivo communication link using microscopic antennas at radio frequencies is severely limited by the requirement not to damage the tissue surrounding the antennas.

For dipole-like antennas the strong electric field dissipates too much power into body tissues. Loop-type antennas have a strong magnetic near field and so dissipate less power into the surrounding tissues but they require such a large current that the antenna temperature is raised to the thermal damage threshold of the tissue.

A solution is to increase the antenna size into hundreds of microns, which makes reporting on an individual neuron impossible. However, recently demonstrated true magnetic antennas offer an alternative solution. The near field of these antennas is dominated by the magnetic field yet they don’t require large currents. Thus they combine the best characteristics of dipoles and loops. By calculating the coupling between identical magnetic antennas inside a model of the body medium it is shown that an increase in the power transfer of up to 8 orders of magnitude higher than could be realized with the loops and dipoles, making the microscopic RF in-vivo transmitting antenna possible.

This project involved the study and mathematical modeling of existing topologies and their electromagnetic simulation to validate the proposed concepts.

[1] Tara Yousefi, Rodolfo E. Diaz; “Pushing the limits of radiofrequency (RF) neuronal telemetry”, Nature Scientific Reports 5, Article number: 10588 (2015); doi:10.1038/srep10588

* Due to covid-19 restrictions, this project will focus more on simulations in Keysight ADS and/or other software *

Supervisor name: 
Dimitris Anagnostou
Supervisor and Deputy email addresses: 
d.anagnostou@hw.ac.uk
Deputy name: 
George Goussetis