A 162 GHz Ring Resonator based High Resolution Dielectric Sensor

This paper introduces a high resolution dielectric sensor at 162GHz. The proposed system consists of a fundamental oscillator as the transmitter, a ring resonator based dielectric sensor, and a low noise super-regenerative receiver. A sinusoidal tone, generated by the transmitter, passes through the sensor and gets different attenuation due to the resonant frequency shift resulting from materials of different dielectric constants. The super-regenerative receiver then detects the resulting small signal difference caused by different dielectric constants to complete the sensing operation. Thanks to the ring resonator’s high sensitivity and receiver’s ultra-low noise, the sensor demonstrates the best dielectric constant sensing resolution of 3.10×10-4 at the frequency range above 100GHz. The sensing system consumes total of 9mW DC power.