A Bioresorbable Backscatter Sensor

We present the design, simulation, fabrication and measurement results of a biodegradable sensor for post operative monitoring. A backscattering measurement technique is demonstrated to detect frequency shifts resulting from the change in the thickness of a sensing film. Our sensor is composed of a modified split-ring resonator loaded with interdigitated capacitors. The sensor operates at around 3.2 GHz in free space and around 2 GHz in liquid solution. We demonstrated that our backscattering measurement data, quantified as resonance frequency in a laboratory environment, matches well with the simulation results.