DOI: 10.1109/TMTT.2023.3293020   IEEEXplore: https://ieeexplore.ieee.org/document/10184500

Backscatter radio that is modulated by a moving or shape-changing dielectric in the near field such as a human heart.

Sub-1GHz

Motion in the near field is calculated with a differential backscatter model for electromagnetic field perturbation of the electric dipole mode of a dielectric sphere produced by the motion of the sphere in the near field.

Human heartbeat monitoring.

Average cross-correlation higher than 0.98. Adjusted R2 from 0.86 to 0.89 in multiple positions relative to a target phantom torso at frequencies from 750 to 900 MHz.