Numerical analysis of the tubular dielectric resonator with a dielectric tuning rod

Kajfez, D.; Lebaric, J.

doi:10.1109/mwsym.1989.38949

Cited by 6 publications

(8 citation statements)

References 5 publications

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“…The assembly was placed on the cold head of a two-stage GiffordMcMahon cryocooler ͑Cryophysics, Abingdon, U.K.͒ which operates over the temperature range of 10 K-320 K. The frequency, insertion loss, and loaded Q were measured at small temperature intervals. The radial mode matching technique 19 was used to calculate the relative permittivity ⑀ r and loss tangent tan ␦ from these data, as well as the temperature coefficient of resonant frequency. Raman spectra were taken with a Renishaw Raman microscope ͑system 2000͒, the excitation source was a 488 nm Ar ϩ laser, and the sample was placed on a temperature stage capable of cooling to 77 K.…”

Section: Methods: Experimentsmentioning

confidence: 99%

Microwave dielectric loss in oxides: Theory and experiment

Aupi

Breeze

Ljepojevic

et al. 2004

Journal of Applied Physics

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We present a model that provides a description of the microwave dielectric loss in oxides. The dielectric loss ͑tan ␦͒ in single crystal and polycrystalline MgO and Al 2 O 3 is measured over the temperature range 70-300 K. We are able to model the dielectric loss in terms of a two-phonon difference model. There are two key parameters in this model: The third derivative, 3 , of the lattice potential and the linewidth, ␥, of the thermal phonons. In polycrystalline samples, rather than considering the different mechanisms of extrinsic loss, it is assumed that the main effect of extrinsic factors is a modification of the linewidth of the thermal phonons. By varying ␥(T), it is shown that the model can describe the loss in both single crystals and polycrystallines materials. In single crystal and polycrystalline MgO, we use ␥ as a fitting parameter. In single crystal and polycrystalline Al 2 O 3 , we obtain ␥(T) by Raman spectroscopy. The theory gives the right order of magnitude of the measured loss.

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Section: Methods: Experimentsmentioning

confidence: 99%

Microwave dielectric loss in oxides: Theory and experiment

Aupi

Breeze

Ljepojevic

et al. 2004

Journal of Applied Physics

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“…Dielectric resonator theory provides a description of the variational resonant modes, especially for dielectric resonators with complex shapes [173,174]. To select suitable relative permittivity, geometrical shapes, and sizes of dielectric blocks, various resonance modes can be stimulated at required frequencies [175,176].…”

Section: Metamaterial/metasurface Design Using High Permittivity Ferr...mentioning

confidence: 99%

Ferroelectric composite artificially-structured functional material: multifield control for tunable functional devices

Wang¹,

Lou²,

Wang³

et al. 2022

J. Phys. D: Appl. Phys.

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Artificially-structured functional materials (AFMs) are artificial media that combine the advantages of nature materials and artificial structures to produce excellent and unexpected properties. Ferroelectric materials have key features in possessing spontaneous polarizations, which can be switched by using electric field, temperature, and strain. This review article attempts to provide a comprehensive insight into the current development of ferroelectric composite AFMs, and to introduce a developing subject in realizing multifield controls for tunable functional devices. Some typical ferroelectric materials and their multifield tunable mechanisms are summarized in detail. The incorporation of ferroelectric materials can yield various designs of AFMs to modulate electromagnetic waves. Recent progress of typical designs with different tuning strategies for active AFMs are illustrated and compared, including the metamaterials, metasurfaces, heterojunctions, superlattices, and their hybrid designs. This scientific subject involves interesting research topics of electromagnetism, electronics, optoelectronics, and ferroelectrics, which is significant to bring novel functionalities via multifield controls.

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“…[49][50][51] In this case, dielectric materials are working as sub-wavelength DRs. According to the DR theory, [52][53][54] varied resonant modes are inspired at designed frequencies by tuning geometrical shapes, size parameters and relative permittivity.…”

Section: The Basic Principle Of Designing Adm-fssmentioning

confidence: 99%

All-dielectric metamaterial frequency selective surface

Wang

et al. 2017

J. Adv. Dielect.

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Frequency selective surface (FSS) has been extensively studied due to its potential applications in radomes, antenna reflectors, high-impedance surfaces and absorbers. Recently, a new principle of designing FSS has been proposed and mainly studied in two levels. In the level of materials, dielectric materials instead of metallic patterns are capable of achieving more functional performance in FSS design. Moreover, FSSs made of dielectric materials can be used in different extreme environments, depending on their electrical, thermal or mechanical properties. In the level of design principle, the theory of metamaterial can be used to design FSS in a convenient and concise way. In this review paper, we provide a brief summary about the recent progress in all-dielectric metamaterial frequency selective surface (ADM-FSS). The basic principle of designing ADM-FSS is summarized. As significant tools, Mie theory and dielectric resonator (DR) theory are given which illustrate clearly how they are used in the FSS design. Then, several design cases including dielectric particle-based ADM-FSS and dielectric network-based ADM-FSS are introduced and reviewed. After a discussion of these two types of ADM-FSSs, we reviewed the existing fabrication techniques that are used in building the experiment samples. Finally, issues and challenges regarding the rapid fabrication techniques and further development aspects are discussed.

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Numerical analysis of the tubular dielectric resonator with a dielectric tuning rod

Cited by 6 publications

References 5 publications

Microwave dielectric loss in oxides: Theory and experiment

Microwave dielectric loss in oxides: Theory and experiment

Ferroelectric composite artificially-structured functional material: multifield control for tunable functional devices

All-dielectric metamaterial frequency selective surface

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