Abstract
This study presents a microwave planar sensor for characterisation of powdered foods. The sensor is based on four coupled resonators designed to have four poles in the frequency range of 1.0-3 GHz. The pole with more sensitivity is used to measure the samples. The frequency characteristics of the sensor are obtained measuring several well-known samples. It is used to estimate the permittivity of six types of grains. The grains are two types of oatmeal, three types of corn and wheat flour. The experimental results have shown a sensitivity of 36 MHz/Fm -1 . The estimated permittivity of materials can be used as the preliminary data for further investigation.
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