Design Symmetric and Asymmetric Single Circular Split Ring Microwave Sensor Using COMSOL Multiphysics

Abstract

Microwave sensors are very promising for sensing the biological medium with different advantages such as non-invasive and miniaturized dimensions. In this paper, the analysis of the change in the geometry parameters of a planar circular split microwave sensors for detecting and characterizing the dielectric properties of different materials is presented. The study is applied on two main types of sensors, a planar symmetrical split ring resonator (SSRR) and a planar Asymmetrical split ring resonator (ASRR). These sensors are used to investigate the difference in dielectric properties of the medium which affected the resonance frequency based on the perturbation theory. The results show a comprehensive study for the microwave sensor. It can be used in different application as a high sensitivity sensor to extract the difference among more matched materials in S-parameters. The mathematical model is developed for the accurate calculation of shifts in the resonant frequencies, transmission, and reflection coefficients S21 and S11 under loaded materials vs the change of sensor geometric and the orientation of the gap. The analysis and simulation are investigated using COMSOL Multiphysics tool.