GUNN-EFFECT DEVICE WHICH MEASURES CHARACTERISTICS OF DIELECTRIC MATERIALS Russian patent published in 1997 - IPC

FIELD: instruments which measure thickness and dielectric permeability of dielectric materials. SUBSTANCE: device has first gate which is inserted between input of amplifier and resistor which is connected to power supply circuit of Gunn-effect diode. Third gate is inserted between high-frequency detector and input of amplifier. Control unit for second and third gates is connected to output of low-pass filter. Fourth gate is inserted between power supply circuit and first and second inputs of control unit. Second memory unit is connected to input of amplifier. Low-pass filter is designed as resistor and capacitor and is connected to circuit of indicator. Power supply of Gunn-effect diode is designed as pulse saw-tooth voltage source. EFFECT: possibility to measure two characteristics simultaneously. 1 dwg