Dielectric spectroscopy with a spiral resonator
What is it about?
Tracking changes in blood glucose levels is important for diabetics, as well as for healthy subjects (e.g., first responders, astronauts, military personnel). One method involves looking for changes in the dielectric properties (permittivity) of body tissue, and mapping those changes to changes in blood glucose levels. Microwave resonators can be used for this purpose, but determining the permittivity can be challenging, particularly with complex resonator geometries required to make compact devices. Our paper shows how numerical techniques can be applied to accurately determine the permittivity when no closed-form (analytic) equation exists (as with complex geometries). A spiral resonator is used as an example.
Why is it important?
As well as demonstrating, for the first time, the use of numerical techniques to establish a relationship between measurable resonator parameters (e.g., shift in resonant frequency) and the permittivity of the sample above the resonator, this paper investigates a number of error sources that degrade accuracy in dielectric spectroscopy measurements. The technique is general and not limited to body tissue measurements, but the application to blood glucose monitoring could assist researchers around the world in making wearable, non-invasive, continuous blood glucose monitoring a reality,.
The following have contributed to this page: Dr Robert N Foster