INVESTIGATION THE SENSING DEPTH OF RG405 FLAT-ENDED SENSOR AT LOW MICROWAVE FREQUENCIES

Abstract

Based on the high contrast in the dielectric properties of different tissue types at microwave frequencies, the minimum detectable distance of RG405 flat open-ended coaxial probe is examined using a two-layer structure of different dielectric properties. Since the penetration depth of the scattered electric field produced at the probe aperture is a function of dielectric properties and frequency, the probe performance is tested and verified by carrying out simulations of the fields near the probe for different measurement configurations and intended to illustrate the impact of other materials on the field patterns which ultimately influence the reflection coefficient calculations. Using EMPro software, S₁₁ values were computed for the coaxial probe placed against a layered medium with lossless and lossy phantom experiments. A noticeable contrast is obtained even with two different low lossless materials at 0.1GHz to 3GHz.