Applications of Dielectric Resonators

Mohanan, P.; Mridula, S.

doi:10.1002/9781119208549.ch16

Cited by 6 publications

(5 citation statements)

References 67 publications

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“…9,27,28 For all Fe-doping concentrations studied in this investigation, the EPR transition spectral width increases with Fe 3+ concentration as a result of dipolar broadening, as illustrated in Figure 8A,B. 29 The average distance between the paramagnets can be estimated using the total Fe 3+ concentration from the mean interparticle distance r ≈ N − 1 3 with the calculated values in Figure 8A,B using the dipolar broadening equation 29 in dilute systems.…”

Section: Investigation To Optimize the Smart Materials Switching Properties Of Fe-doped Laalomentioning

confidence: 66%

“…High-performance microwave dielectric ceramic resonators are extensively used to produce filters, antennas, and oscillators in wireless communication systems. [1][2][3][4] For optimal device performance, the dielectric materials should have a low loss tangent (tan δ) of less than ~10 −3 , an appropriate permittivity for the desired device size and operational resonant frequency, and a temperature coefficient of resonant frequency (τ f ) of zero or near zero. In order to compensate τ f to zero for these ceramic resonators, transition metals are introduced into the perovskites' cation sites.…”

Section: Introductionmentioning

confidence: 99%

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Development of magnetically switchable high permittivity microwave dielectrics using La(Al_1‐xFe_x)O₃

2021

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The introduction of transition metal doping, particularly Fe3+, into high‐performance microwave dielectrics can make “smart” materials that switch between a high‐Q, low loss state and a low‐Q, high loss state using a small external magnetic field. In this study, the dielectric and magnetic properties of the high permittivity host material LaAlO3 (εr = 22.5), when doped with Fe3+, are reported. Spin losses dominate the loss tangent at cryogenic temperatures and survive up to room temperature. Peaks in the loss tangent versus temperature relation are observed near 40, 75, and 215 K. Additional measurements of samples exposed to annealing in varying environments, combined with Debye analysis and the results of native defect energy predictions from density functional calculations[Phys Rev B. 2009;80:104115], allows us to associate the 40, 75, and 215 K peaks to the following reactions, normalOnormalinormalx+normalVnormalOnormalx→normalOnormali′+normalVnormalO·, FeAlnormalx+normalVAl″→FeAl′+normalVAl′, and Alnormalinormalx+Alnormali··→2Alnormali·, respectively.

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Section: Investigation To Optimize the Smart Materials Switching Properties Of Fe-doped Laalomentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Development of magnetically switchable high permittivity microwave dielectrics using La(Al_1‐xFe_x)O₃

2021

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“…Initially, DRAs were applied predominantly in rectangular shapes, before Long et al proposed the cylindrical dielectric cavity antenna, which proved to be advantageous in the mmW region [35]. Many novel DRA applications have been introduced in recent years, offering great improvements in terms of bandwidth, gain and coupling [36]. Depending on the intended antenna application, many different geometries, parameters, excitation methods and resonant modes are employed in DRAs.…”

Section: Requirements Of Millimetre Wave Dielectricsmentioning

confidence: 99%

Silicate dielectric ceramics for millimetre wave applications

Kamutzki

Schneider

Barowski

et al. 2021

Journal of the European Ceramic Society

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Silicate ceramics are of considerable promise as high frequency dielectrics in emerging millimetre wave applications including high bandwidth wireless communication and sensing. In this review, we show how high quality factors and low, thermally stable permittivities arise in ordered silicate structures. On the basis of a large number of existing studies, the dielectric performance of silicate ceramics is comprehensively summarised and presented, showing how microstructure and SiO4 tetrahedral connectivity affect polarizability and dielectric losses. We critically examine the appropriateness of silicate materials in future applications as effective millimetre wave dielectrics with low losses and tuneable permittivities. The development of new soft chemistry based processing routes for silicate dielectric ceramics is identified as being instrumental towards the reduction of processing temperatures, thus enabling silicate ceramics to be co-fired in the production of components functioning in the mm wave regime.

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“…The IEEE 802.15 group has recognized standard applications for body-centric communications [ 314 ]. Various types of wearable antennas can be used in the WBAN applications, such as reconfigurability, rectennas, and dielectric resonating antennas [ 315 , 316 , 317 , 318 ]. The demand for smaller wearable devices is increasing, especially in daily-use appliances.…”

Section: Applications Of Wearable Antennasmentioning

confidence: 99%

Recent Advances of Wearable Antennas in Materials, Fabrication Methods, Designs, and Their Applications: State-of-the-Art

et al. 2020

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The demand for wearable technologies has grown tremendously in recent years. Wearable antennas are used for various applications, in many cases within the context of wireless body area networks (WBAN). In WBAN, the presence of the human body poses a significant challenge to the wearable antennas. Specifically, such requirements are required to be considered on a priority basis in the wearable antennas, such as structural deformation, precision, and accuracy in fabrication methods and their size. Various researchers are active in this field and, accordingly, some significant progress has been achieved recently. This article attempts to critically review the wearable antennas especially in light of new materials and fabrication methods, and novel designs, such as miniaturized button antennas and miniaturized single and multi-band antennas, and their unique smart applications in WBAN. Finally, the conclusion has been drawn with respect to some future directions.

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Applications of Dielectric Resonators

Cited by 6 publications

References 67 publications

Development of magnetically switchable high permittivity microwave dielectrics using La(Al_1‐xFe_x)O₃

Development of magnetically switchable high permittivity microwave dielectrics using La(Al_1‐xFe_x)O₃

Silicate dielectric ceramics for millimetre wave applications

Recent Advances of Wearable Antennas in Materials, Fabrication Methods, Designs, and Their Applications: State-of-the-Art

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Applications of Dielectric Resonators

Cited by 6 publications

References 67 publications

Development of magnetically switchable high permittivity microwave dielectrics using La(Al1‐xFex)O3

Development of magnetically switchable high permittivity microwave dielectrics using La(Al1‐xFex)O3

Silicate dielectric ceramics for millimetre wave applications

Recent Advances of Wearable Antennas in Materials, Fabrication Methods, Designs, and Their Applications: State-of-the-Art

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Product

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Development of magnetically switchable high permittivity microwave dielectrics using La(Al_1‐xFe_x)O₃

Development of magnetically switchable high permittivity microwave dielectrics using La(Al_1‐xFe_x)O₃