Design of double ring resonator (DRR) for material properties measurement

In this paper, a new topology of microwave resonant sensor (MRS) using 1 GHz microstrip double ring resonator (DRR) is presented for measurement of biological tissues such as chicken, beef and fish. This design is based on electromagnetic simulation in terms of resonant frequency, quality factor and permittivity. The sample is placed on the DRR in order to measure its properties. Any change in the sample permittivity leads to change in the resonance frequency. Results from this study show that the Q-factor of the resonant decreases when the DRR with overlay sample of meat; however, the frequency shift increases when the thickness of the sample increases. Material properties measurement provides useful information that can be used to improve the processing, design, control and quality of product.