Patent ID: 7371217

Claim:
A device for a non-invasive measurement of blood glucose concentrations by millimeter waves, the device comprising: a millimeter wave generator which creates an electromagnetic wave in a specified frequency band; a TE10 mode rectangular waveguide which transmits a millimeter wave generated by the millimeter wave generator; a plane parallel plate which has a refractive index and a thickness determined to yield a minimal power reflection coefficient of the electromagnetic wave in the specified frequency band and which is installed at an end of the TE10 mode rectangular waveguide to be positioned at a front end of a dielectric object under test; power detectors which detect the powers of an incident wave generated by the millimeter wave generator and a reflected wave from the dielectric object through the plane parallel plate; a temperature sensor which measures a temperature of the dielectric object; and a reader which reads the minimum power reflection coefficient and a corresponding frequency of the reflected wave from the powers of the incident and reflected waves detected by the power detectors.