Microwave Single Ring Resonating Sensor for Food Sensing

Abstract

A single ring microwave sensor resonating at 5 GHz has been designed and simulated using ADS tool for various sample materials. The sensor is rectangular ring with coupled feedline for excitation. Strip lines are of copper and substrate taken is Rogers $5880\left(\varepsilon_{r}=2.2\right)$. The food materials whose dielectric is to be measured is placed above the sensor such that the material covers top layer of sensor completely. A consistent shift in the reflection co-efficient along with the variations in attenuation at each frequency shift was observed. The frequency shift and attenuation for respective materials is analyzed and an equation fitting the data has been given.