Design of resonator cavity for liquid material characterization

Abstract

Dielectric characterization is very essential before the material can be utilized in designing microwave networks. Circular cylindrical resonators have been widely used for material characterization, but it is not a preferable design during the measurement of liquid samples as the sample placement requires repetitive process of opening and closing the lid of the cavity. This repetition procedure easily affects the accuracy of measurement and may lead to a measurement error. In this study, a rapid and less measurement procedure of liquid material characterization is proposed. The proposed rectangular resonator design is far more convenient and easier to handle as it does not require complex sample preparation. Considering electric field leakage, a hole is designed at the top of the cavity to ease the inserting process of sample. A 5-GHz prototype of a rectangular resonator is designed and fabricated to measure a liquid sample. Complex scattering parameters are measured using a vector network analyzer before the dielectric properties are estimated using an inverse technique. The dielectric properties of distilled water are measured to demonstrate the practicality of the proposed measurement technique. As a result, the measured dielectric properties of distilled water show a reasonable agreement with the values from other literature.

Effect of Fiber Morphology and Elemental Composition of Ananas comosus Leaf on Cellulose Content and Permittivity

“…The permittivity measurement can be performed using the free-space, waveguide [29][30][31], or resonant [32][33][34][35] techniques. In this study, the permittivity was measured using the waveguide technique in the microwave region [29,30], with the measurement taking place in the G-band, which covers the frequency ranges of 3.95 to 5.85 GHz.…”

Utilization of Pineapple Leaf in Fiber-based Dielectric Composite Material and Its Elemental Composition Analyses

“…Permittivity measurement could be done using either free-space, waveguide [34,35], or resonant techniques [36][37][38][39]. In this work, wide-band measurement, i.e., waveguide technique, is preferred in order to provide dielectric value for wide applications.…”

Seawater salinity modelling based on electromagnetic wave characterization

“…Another study has discussed antenna material [19] followed by [20] that could be used in wireless applications based on material permittivity, while trough gathering more electrical properties could achieve notable power radiation. Nevertheless, in [21] the liquid material characterization had been explored via dielectric characterization with unadvisable measurement of liquid samples due to the repetitive process of opening and closing the lid of the cavity that could lead to errors in the measurement process. Whereas the dielectric dense patch antenna was proposed in [22] to study Zamzam and distilled water at 5 GHz applications, and the significant result demonstrated a return loss between 4.41-5.52 GHz that reaches up to -10 dB, hence the strongest aspects of the study is considering the water composition which is could play a vital role in terms of propagation performance.…”