Circuital Analysis of Cylindrical Structures Applied to the Electromagnetic Resolution of Resonant Cavities

Peñaranda‐Foix, Felipe L.; Catalá-Civera, J.M.

doi:10.5772/9400

Cited by 8 publications

(2 citation statements)

References 20 publications

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“…The developed electromagnetic (EM) numerical method of the MW cavity to calculate the dielectric properties of the materials made use of circuit analysis and mode-matching techniques 42 , as described in detail in previous work 39 . This technique involves decomposing the complex MW cavity into simpler canonical circuits, which are analyzed and computed independently and then connected to assemble the complete structure.…”

Section: Methodsmentioning

confidence: 99%

Temperature-dependent complex dielectric permittivity: a simple measurement strategy for liquid-phase samples

Baker-Fales,

Gutiérrez-Cano,

Catalá-Civera

et al. 2023

Sci Rep

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Microwaves (MWs) are an emerging technology for intensified and electrified chemical manufacturing. MW heating is intimately linked to a material’s dielectric permittivity. These properties are highly dependent on temperature and pressure, but such datasets are not readily available due to the limited accessibility of the current methodologies to process-oriented laboratories. We introduce a simple, benchtop approach for producing these datasets near the 2.45 GHz industrial, medical, and scientific (ISM) frequency for liquid samples. By building upon a previously-demonstrated bireentrant microwave measurement cavity, we introduce larger pressure- and temperature-capable vials to deduce temperature-dependent permittivity quickly and accurately for vapor pressures up to 7 bar. Our methodology is validated using literature data, demonstrating broad applicability for materials with dielectric constant ε' ranging from 1 to 100. We provide new permittivity data for water, organic solvents, and hydrochloric acid solutions. Finally, we provide simple fits to our data for easy use.

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Section: Methodsmentioning

confidence: 99%

Temperature-dependent complex dielectric permittivity: a simple measurement strategy for liquid-phase samples

Baker-Fales,

Gutiérrez-Cano,

Catalá-Civera

et al. 2023

Sci Rep

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“…The glasses are characterized following the classical methods, therefore for each cell, the properties of the glasses are known. Thus, the modal analysis method described [15][16][17] is used, where the structure is divided in canonical circuital elements and the only unknown is the dielectric properties of the LC material. The chosen working mode of the resonator is based on the field distribution.…”

Section: Methods Descriptionmentioning

confidence: 99%

Measurement of the Dielectric Properties of Liquid Crystal Material for Microwave Applications

Sánchez

Nova

Martín

et al. 2019

Proceedings 17th International Conference on Microwave and High Frequency Heating

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Liquid Crystal (LC) is an anisotropic liquid material which flows like a liquid, but at the same time its molecules have an orientational order like in the solid state [1]. Thus, LC is a promising dielectric material for designing reconfigurable devices at microwave frequencies. In order to optimize the design of reconfigurable microwave devices, accurate values of the dielectric permittivity and the loss tangent of LCs are needed. However, new LCs are not well characterized at these frequencies because of its recent use for microwave applications. Therefore, the characterization in this frequency range is required for its practical use within microwave components and devices [2]. In this work, the split-cylinder resonator method has been used for the characterization of LCs at two frequency points, i.e. 5 and 11 GHz. The method is based on the measurement of the resonance frequency and quality factor of the two states of the LC molecules for extracting the complex dielectric permittivity [3]. For achieving these two states, no electric or magnetic fields are needed, just the cell must be turned 90º inside the cavity. The dielectric properties (permittivity and loss tangent) of four different LC samples, GT3-23002 from Merck and QYPD193, QYPD142, and QYPD036 from Qingdao QY Liquid Crystal Co, have been obtained. The highest values of the dielectric anisotropy are presented for the samples QYPD036 and QYPD193, together with the highest values of the corresponding loss tangent parameters. Furthermore, it is observed for all the LCs that the loss tangent decreases and the dielectric anisotropy increases at higher frequencies, which must be taken into account in the development of reconfigurable microwave devices.

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Physics of Microwave Heating

Horikoshi,

Catalá-Civera,

Schiffmann

et al. 2024

Microwave Chemical and Materials Processing

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Circuital Analysis of Cylindrical Structures Applied to the Electromagnetic Resolution of Resonant Cavities

Cited by 8 publications

References 20 publications

Temperature-dependent complex dielectric permittivity: a simple measurement strategy for liquid-phase samples

Temperature-dependent complex dielectric permittivity: a simple measurement strategy for liquid-phase samples

Measurement of the Dielectric Properties of Liquid Crystal Material for Microwave Applications

Physics of Microwave Heating

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