RESONANT DEVICE FOR NEAR-FIELD MICROWAVE INSPECTION OF PARAMETERS OF MATERIALS Russian patent published in 2014 - IPC G01N22/00 G01R27/26 

FIELD: radio engineering, communication.

SUBSTANCE: device comprises a microwave generator with a rectangular waveguide connected to it, having a measuring device with a waveguide resonance system as a terminal device, wherein the terminal device includes a capacitive metal diaphragm. According to the solution, the capacitive metal diaphragm is superimposed with a plane-parallel dielectric sample with an area equal to the area of the waveguide flange, and the dielectric sample is superimposed with a probe in the form of a metal wire with length of 12-20 mm and diameter of 0.1-0.5 mm with a sharp end, bent at a right angle; the longer section of the probe lies on a dielectric plate perpendicular to the slit in the diaphragm, and the shorter section of the probe with the sharp end is perpendicular to the plane of the dielectric sample, wherein the thickness of the plane-parallel dielectric sample t is selected based on the condition $$t\sqrt{\epsilon }\langle \langle {\lambda }_v,$$ where λ_v is the fundamental wavelength in the waveguide, ε is the permittivity of the plate.

EFFECT: high resolution and high sensitivity.

3 dwg, 1 ex