Determination of solid material permittivity using T-ring resonator for food industry

• Published in: Telkomnika Vol. 17; no. 1; pp. 489 - 496
• Main Authors: Alahnomi, Rammah A., Zakaria, Z., Yussof, Zulkalnain Mohd, Sutikno, Tole, Bahar, Amyrul Azuan Mohd, Alhegazi, Ammar
• Format: Journal Article
• Language: English
• Published: Yogyakarta Ahmad Dahlan University 01.02.2019
• Subjects: Accuracy; Copper; Dielectric properties; Electric fields; Food; Food processing industry; Fuzzy logic; Permittivity; Quality control; Resonant frequencies; Resonators; Sensitivity analysis; Sensors; Substrates
• ISSN: 1693-6930; 2302-9293
• DOI: 10.12928/telkomnika.v17i1.11636

[...]the half-wave line resonator has disadvantages of having large size of substrate area, and less accuracy measurement for higher frequencies causes by radiation losses of coupling gaps as indicated in Figure 1. [...]the quarter-half wave resonator is developed for reducing the radiation, improving the accuracy of measurement, and minimizing the circuit size. (5) where: Q is the measurement of quality-factor fo is the resonant frequency (MHz) B.W is the bandwidth at 3dB (MHz) 3.Results and Analysis 3.1.Location of Material under Test (MUT) The change of the resonance frequency behavior is based on the interacting the electric field of the T-ring resonator with the test materials which is known as material under test (MUT). [...]it is mainly important to determine the region for locating the MUT for accuracy and sensitivity of the measurement where in this case; a maximum electric field of T-ring resonator is demonstrated in Figure 4 (a) (The red color illustrates the most electric field region). The simulated frequency is slightly shifted from the theory by 3 MHz to the higher frequency. 3.3.Sensitivity Analysis The response of the T-ring resonant frequency is dependent on the dielectric constant of the surrounding materials. [...]when the tested material with different value of permittivity is tested on the T-ring, the electric field of the resonator is perturbed and causes a change in the resonant frequency. [...]a further increment of sample's thickness will not affect the resonant frequency and sensitivity of the sensor. 4.Conclusion This paper proposes a T-ring resonator solid material sensor.