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Journal articles on the topic 'Colossal equivalent relative permittivity'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Dong, Wen, Wanbiao Hu, Terry J. Frankcombe, et al. "Colossal permittivity with ultralow dielectric loss in In + Ta co-doped rutile TiO2." Journal of Materials Chemistry A 5, no. 11 (2017): 5436–41. http://dx.doi.org/10.1039/c6ta08337d.

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Electron-pinned defect dipoles, in the form of highly stable triangle-diamond and/or triangle-linear dopant defect clusters with well defined relative positions for Ti reduction, are present in rutile In + Ta co-doped TiO<sub>2</sub> for the colossal permittivity and low loss.

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2

Kotb, Hicham Mahfoz, Adil Alshoaibi, Javed Mazher, Nagih M. Shaalan, and Mohamad M. Ahmad. "Colossal Permittivity Characteristics of (Nb, Si) Co-Doped TiO2 Ceramics." Materials 15, no. 13 (2022): 4701. http://dx.doi.org/10.3390/ma15134701.

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(Nb5+, Si4+) co-doped TiO2 (NSTO) ceramics with the compositions (Nb0.5Si0.5)xTi1−xO2, x = 0, 0.025, 0.050 and 0.1 were prepared with a solid-state reaction technique. X-ray diffraction (XRD) patterns and Raman spectra confirmed that the tetragonal rutile is the main phase in all the ceramics. Additionally, XRD revealed the presence of a secondary phase of SiO2 in the co-doped ceramics. Impedance spectroscopy analysis showed two contributions, which correspond to the responses of grain and grain-boundary. All the (Nb, Si) co-doped TiO2 showed improved dielectric performance in the high frequen

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3

He, Jiayang, Yanwei Huang, Guang Feng, Si Shen, Ming Yan, and Heping Zeng. "Rapid Laser Reactive Sintering Synthesis of Colossal Dielectric CCTO Ceramics." Applied Sciences 10, no. 10 (2020): 3510. http://dx.doi.org/10.3390/app10103510.

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Calcium copper titanate (CCTO) ceramics were successfully synthesized using a rapid laser reactive sintering method without conventional long heat treatment times. The microstructure, dielectric properties, and impedance spectroscopy results for CCTO sintered at laser power rates of 25–85 W were investigated in detail. The X-ray diffractometry results showed that prepared CCTO is polycrystalline in a cubic structure with high purity. Scanning electron microscopy showed that CCTO sintered at 85 W has a dense microstructure with an average grain size of 30 nm. The dielectric permittivity of CCTO

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4

Giannoukos, Georgios, Mart Min, and Toomas Rang. "Relative complex permittivity and its dependence on frequency." World Journal of Engineering 14, no. 6 (2017): 532–37. http://dx.doi.org/10.1108/wje-01-2017-0007.

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Purpose This paper aims to give a brief overview of dielectric properties, relative complex permittivity and its dependence on frequency. The significance of different approaches to complex permittivity is also discussed. Design/methodology/approach The different mechanisms of polarization are then presented. Dielectric measurements are given, and an RC parallel-equivalent circuit is used to simulate a parallel plate capacitor, and the way in which the impedance of the circuits is affected by frequency is illustrated in their respective diagrams. The way in which dielectric properties change w

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5

Mahfoz Kotb, H., Osama Saber, and Mohamad M. Ahmad. "Colossal relative permittivity and low dielectric loss in BaFe0.5Nb0.5O3 ceramics prepared by spark plasma sintering." Results in Physics 19 (December 2020): 103607. http://dx.doi.org/10.1016/j.rinp.2020.103607.

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6

Verma, A. K., Y. K. Awasthi, and Himanshu Singh. "Equivalent isotropic relative permittivity of microstrip on multilayer anisotropic substrate." International Journal of Electronics 96, no. 8 (2009): 865–75. http://dx.doi.org/10.1080/00207210902851480.

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7

Jurn, Yaseen Naser, Fareq Malek, Sawsen Abdulahadi Mahmood, Wei Wen Liu, Makram A. Fakhri, and Muataz Hameed Salih. "Modelling and Simulation of Rectangular Bundle of Single-Walled Carbon Nanotubes for Antenna Applications." Key Engineering Materials 701 (July 2016): 57–66. http://dx.doi.org/10.4028/www.scientific.net/kem.701.57.

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This paper aims to present an effective electromagnetic (EM) modelling approach for rectangular bundle of single-walled carbon nanotubes (RB-SWCNTs), based on the electrical conductivity, relative complex permittivity and linear distribution impedance by applying General Ohm’s law for this bundle. The equivalent single conductor material (ESCM) model for personification the RB-SWCNTs is present in this paper. The main target of this modeling approach is to estimate and investigate the EM properties of RB-SWCNTs using common EM engineering tool solver CST (MWS). For this purpose, the RB-SWCNTs

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8

Wang, Ge, Hui Pan, Shimiao Lai, et al. "Dynamic Measurement of Relative Complex Permittivity of Microwave Plasma at Atmospheric Pressure." Processes 9, no. 10 (2021): 1812. http://dx.doi.org/10.3390/pr9101812.

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Complex permittivity is one of the most important parameters to characterize the interaction between microwave and medium, especially for microwave-excited plasma. It is convenient to study plasma’s dielectric properties and microwave propagation characteristics by measuring its complex permittivity. A dynamic measurement method of equivalent relative complex permittivity of microwave-excited plasma at atmospheric pressure is proposed in this paper. Firstly, a cavity based on WR-430 at a frequency of 2.45 GHz was specially designed in COMSOL. Then, the samples with different real parts of comp

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9

Bellucci, Stefano, Antonio Maffucci, Sergey Maksimenko, et al. "Electrical Permittivity and Conductivity of a Graphene Nanoplatelet Contact in the Microwave Range." Materials 11, no. 12 (2018): 2519. http://dx.doi.org/10.3390/ma11122519.

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This paper investigates the electrical properties in the microwave range of a contact made by graphene nanoplatelets. The final goal is that of estimating the range of values for the equivalent electrical complex permittivity of a contact obtained by integrating low-cost graphene in the form of nanoplatelets (GNPs) into a high-frequency electrical circuit. To this end, a microstrip-like circuit is designed and realized, where the graphene nanoplatelets are self-assembled into a gap between two copper electrodes. An experimental characterization is carried out, both to study the structural prop

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10

Pacini, Alex, Alessandra Costanzo, and Diego Masotti. "A theoretical and numerical approach for selecting miniaturized antenna topologies on magneto-dielectric substrates." International Journal of Microwave and Wireless Technologies 7, no. 3-4 (2015): 369–77. http://dx.doi.org/10.1017/s1759078715000859.

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An increasing interest is arising in developing miniaturized antennas in the microwave range. However, even when the adopted antennas dimensions are small compared with the wavelength, radiation performances have to be preserved to keep the system-operating conditions. For this purpose, magneto-dielectric materials are currently exploited as promising substrates, which allows us to reduce antenna dimensions by exploiting both relative permittivity and permeability. In this paper, we address generic antennas in resonant conditions and we develop a general theoretical approach, not based on simp

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11

Alex, Pacini, Costanzo Alessandra, and Masotti Diego. "A theoretical and numerical approach for selecting miniaturized antenna topologies on magneto-dielectric substrates." International Journal of Microwave and Wireless Technologies Volume 7, Issue 3-4 (European Microwave Week 2014), June 2015 (2015): pp. 369–377. https://doi.org/10.1017/S1759078715000859.

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An increasing interest is arising in developing miniaturized antennas in the microwave range. However, even when the adopted antennas dimensions are small compared with the wavelength, radiation performances have to be preserved to keep the system-operating conditions. For this purpose, magneto-dielectric materials are currently exploited as promising substrates, which allows us to reduce antenna dimensions by exploiting both relative permittivity and permeability. In this paper, we address generic antennas in resonant conditions and we develop a general theoretical approach, not based on simp

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12

Kotb, Hicham Mahfoz, Hassan A. Khater, Osama Saber, and Mohamad M. Ahmad. "Sintering Temperature, Frequency, and Temperature Dependent Dielectric Properties of Na0.5Sm0.5Cu3Ti4O12 Ceramics." Materials 14, no. 17 (2021): 4805. http://dx.doi.org/10.3390/ma14174805.

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NSCTO (Na0.5Sm0.5Cu3Ti4O12) ceramics have been prepared by reactive sintering solid-state reaction where the powder was prepared from the elemental oxides by mechanochemical milling followed by conventional sintering in the temperature range 1000–1100 °C. The influence of sintering temperature on the structural and dielectric properties was thoroughly studied. X-ray diffraction analysis (XRD) revealed the formation of the cubic NSCTO phase. By using the Williamson–Hall approach, the crystallite size and lattice strain were calculated. Scanning electron microscope (SEM) observations revealed th

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13

Sokolova, M. S., K. R. Dzhikirba, A. S. Astrakhantseva, I. V. Kukushkin, and V. M. Muravev. "Plasma Response of a Metallic “Grating” Metasurface on a Substrate." JETP Letters 119, no. 10 (2024): 775–79. http://dx.doi.org/10.1134/s0021364024601258.

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The transmission of electromagnetic radiation through a silicon substrate with a square metallic grid deposited on one side has been studied experimentally. It has been established that the electrodynamic response of the structure is equivalent to the excitation of a transverse electromagnetic plasma mode in it with the plasma frequency determined by the geometric parameters of the grating, as well as by the thickness and relative permittivity of the substrate. A theoretical model has been developed to qualitatively describe the experimental results obtained.

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14

Stanciu, Cătălina A., Ioana Pintilie, Adrian Surdu, et al. "Influence of Sintering Strategy on the Characteristics of Sol-Gel Ba1−xCexTi1−x/4O3 Ceramics." Nanomaterials 9, no. 12 (2019): 1675. http://dx.doi.org/10.3390/nano9121675.

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Single-phase Ce3+-doped BaTiO3 powders described by the nominal formula Ba1−xCexTi1−x/4O3 with x = 0.005 and 0.05 were synthesized by the acetate variant of the sol-gel method. The structural parameters, particle size, and morphology are strongly dependent on the Ce3+ content. From these powders, dense ceramics were prepared by conventional sintering at 1300 °C for 2 h, as well as by spark plasma sintering at 1050 °C for 2 min. For the conventionally sintered ceramics, the XRD data and the dielectric and hysteresis measurements reveal that at room temperature, the specimen with low cerium cont

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15

Ozaki, Tamon, Noriyuki Ito, Jiro Kawai, and Shuhei Nakamura. "Relative Permittivity and Conductivity of Water-treed Region in XLPE Estimated by an Equivalent Circuit." IEEJ Transactions on Fundamentals and Materials 123, no. 5 (2003): 506–12. http://dx.doi.org/10.1541/ieejfms.123.506.

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16

Ozaki, Tamon, Noriyuki Ito, Jiro Kawai, and Shuhei Nakamura. "Relative permittivity and conductivity of water-treed region in XLPE estimated by an equivalent circuit." Electrical Engineering in Japan 148, no. 3 (2004): 7–14. http://dx.doi.org/10.1002/eej.10332.

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17

Packamwongsang, K., S. Noppanakeepong, N. Naranong, P. Phaewbang, P. Pleuksananon, and W. Packamwongsang. "ELECTROCHEMICAL MODEL OF Euglena sanguinea Ehrenberg STIMULATED WITH MULTI-LEVEL ELECTROMAGNETIC FIELDS." ASEAN Journal on Science and Technology for Development 27, no. 2 (2017): 21–44. http://dx.doi.org/10.29037/ajstd.250.

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This research aimed at studying the property of Euglena Sanguinea Ehrenberg (E. sanguinea) before and after being stimulated by multi-level electromagnetic fields (MLEM). After the stimulation, it was found that physical properties were changed, i.e., cell membrane and components deformed. Main biochemical compositions were changed in accordance with new electrochemical equation which was estimated from FTIR bands. Moreover, the estimated electrical results before and after being stimulated, i.e., impedance and complex relative permittivity of main biochemical compositions from extraction, wer

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18

Packamwongsang,, K., S. Noppanakeepong,, N. Naranong,, P. Phaewbang,, P. Pleuksananon,, and And W. Packamwongsang. "Electrochemical model of euglena sanguinea ehrenberg stimulated with multi-level electromagnetic fields." ASEAN Journal on Science and Technology for Development 26, no. 2 (2017): 21–44. http://dx.doi.org/10.29037/ajstd.320.

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This research aimed at studying the property of Euglena Sanguinea Ehrenberg (E. sanguinea) before and after being stimulated by multi-level electromagnetic fields (MLEM). After the stimulation, it was found that physical properties were changed, i.e., cell membrane and components deformed. Main biochemical compositions were changed in accordance with new electrochemical equation which was estimated from FTIR bands. Moreover, the estimated electrical results before and after being stimulated, i.e., impedance and complex relative permittivity of main biochemical compositions from extraction, wer

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19

Rodriguez Barrera, Mario A., and Walter Pereira Carpes Jr. "Particle swarm optimization for the design of square loop frequency selective surfaces considering a model of dielectric effective permittivity." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 35, no. 5 (2016): 1643–55. http://dx.doi.org/10.1108/compel-10-2015-0362.

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Purpose The purpose of this paper is to present the results of a particle swarm optimization (PSO) method applied in the design of a square-loop frequency selective surface (FSS) via the equivalent circuit model (ECM), considering the dielectric effective permittivity as a variable in the optimization problem. Design/methodology/approach In the optimization process considered, besides the FSS square loop geometric parameters, the thickness and relative permittivity of dielectric material used as support are included as variables in the search space, using for this a model of dielectric effecti

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20

Bifano, Luca, Alice Fischerauer, and Gerhard Fischerauer. "Investigation of complex permittivity spectra of foundry sands." tm - Technisches Messen 87, no. 5 (2020): 372–80. http://dx.doi.org/10.1515/teme-2019-0121.

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AbstractThis paper discusses impedance spectroscopy as a method to characterize different types of quartz sand, chromite sand, and mixtures of sand. Based on two types of measurement cells, the impedance spectra for various dry sands were measured. The spectra differ enough to allow the sands to be distinguished. The results were validated by extracting the relative permittivity from the impedance and comparing it to literature data. After that, the method could be applied with confidence to other material systems. The influence of moisture was investigated with two types of quartz sand, and t

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21

Crupi, Giovanni, Xiue Bao, Oluwatosin John Babarinde, Dominique M. M. P. Schreurs, and Bart Nauwelaers. "Biosensor Using a One-Port Interdigital Capacitor: A Resonance-Based Investigation of the Permittivity Sensitivity for Microfluidic Broadband Bioelectronics Applications." Electronics 9, no. 2 (2020): 340. http://dx.doi.org/10.3390/electronics9020340.

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Electronics is a field of study ubiquitous in our daily lives, since this discipline is undoubtedly the driving force behind developments in many other disciplines, such as telecommunications, automation, and computer science. Nowadays, electronics is becoming more and more widely applied in life science, thus leading to an increasing interest in bioelectronics that is a major segment of bioengineering. A bioelectronics application that has gained much attention in recent years is the use of sensors for biological samples, with emphasis given to biosensors performing broadband sensing of small

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22

Wang, Xu, Yuelong Zhang, Tian Zhang, Guanyu Fu, Yinlong Zhu, and Ying Liu. "Modeling and Relative Permittivity Modulation of Cu/PDMS Capacitive Flexible Sensor for Pressure Sensing." Sensors 25, no. 3 (2025): 637. https://doi.org/10.3390/s25030637.

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This study aims to establish an equivalent parallel capacitance model for a copper/polydimethylsiloxane (Cu/PDMS) capacitive flexible pressure sensor and modulate its relative permittivity to optimize pressure sensing performance. The Cu/PDMS composite material is an ideal dielectric layer for sensors due to its high dielectric constant and tunable elasticity. By adjusting the different mixing ratios of PDMS and copper particles in micro size, the components and structure properties of the composite material can be modified, thereby affecting the electrical and mechanical performance of the se

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23

Kazemi, Maryam, Saeedeh Lotfi, Hesam Siahkamari, and Mahmood Mohammadpanah. "UWB Bandpass Filter with Ultra-wide Stopband based on Ring Resonator." Frequenz 72, no. 5-6 (2018): 245–52. http://dx.doi.org/10.1515/freq-2016-0312.

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AbstractAn ultra-wideband (UWB) bandpass filter with ultra-wide stopband based on a rectangular ring resonator is presented. The filter is designed for the operational frequency band from 4.10 GHz to 10.80 GHz with an ultra-wide stopband from 11.23 GHz to 40 GHz. The even and odd equivalent circuits are used to achieve a suitable analysis of the proposed filter performance. To verify the design and analysis, the proposed bandpass filter is simulated using full-wave EM simulator Advanced Design System and fabricated on a 20mil thick Rogers_RO4003 substrate with relative permittivity of 3.38 and

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Chen, Shih-Jui, Yi-Li Chen, Yu-Jui Chang, et al. "Measurement of Electrical Discharge Machining Oil Quality by Analyzing Variations in the Equivalent Relative Permittivity of the Capacitive Sensor." Sensors 20, no. 21 (2020): 6248. http://dx.doi.org/10.3390/s20216248.

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In this study, a concentration monitoring system was successfully developed. A sensor was immersed in electrical discharge machining oil, and the capacitance of the sensor changed as a function of the impurity concentration. Thus, DC voltage variations were produced via a conversion circuit. Carbon black and iron particles with different concentrations were successfully characterized. The capacitance increments were positively correlated with the particle concentration. The linear fitting results based on the impurity concentration were used to express the degree of influence of particles with

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25

Braika Alameen, Sabriya Alghennai Alfitouri, and Abdussalam Ali Ahmed. "Effect of dust storms on (GSM) signal north region of Libya." World Journal of Advanced Research and Reviews 14, no. 1 (2022): 504–19. http://dx.doi.org/10.30574/wjarr.2022.14.1.0351.

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Propagation mechanisms are very complex and diverse, because of the separation between the receiver and the transmitter, attenuation (reduction or loss) of the signal strength occurs. Field study will be conducted in amid north region of Libya (Bani Walid), which has high wind speed, and high attenuation loss, desert climate, and frequent dust and sand storms. This phenomenon actually influenced on wireless communication systems (GSM signal), neither the effect of the humidity on the complex permittivity nor the antenna height on the visibility, where by its effect on both attenuation and cros

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Braika, Alameen, Alghennai Alfitouri Sabriya, and Ali Ahmed Abdussalam. "Effect of dust storms on (GSM) signal north region of Libya." World Journal of Advanced Research and Reviews 14, no. 1 (2022): 504–19. https://doi.org/10.5281/zenodo.7034206.

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Propagation mechanisms are very complex and diverse, because of the separation between the receiver and the transmitter, attenuation (reduction or loss) of the signal strength occurs. Field study will be conducted in amid north region of Libya (Bani Walid), which has high wind speed, and high attenuation loss, desert climate, and frequent dust and sand storms. This phenomenon actually influenced on wireless communication systems (GSM signal), neither the effect of the humidity on the complex permittivity nor the antenna height on the visibility, where by its effect on both attenuation and cros

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27

Stoneman, Michael R., and Valerică Raicu. "Dielectric Spectroscopy Based Detection of Specific and Nonspecific Cellular Mechanisms." Sensors 21, no. 9 (2021): 3177. http://dx.doi.org/10.3390/s21093177.

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Using radiofrequency dielectric spectroscopy, we have investigated the impact of the interaction between a G protein-coupled receptor (GPCR), the sterile2 α-factor receptor protein (Ste2), and its cognate agonist ligand, the α-factor pheromone, on the dielectric properties of the plasma membrane in living yeast cells (Saccharomyces cerevisiae). The dielectric properties of a cell suspension containing a saturating concentration of α-factor were measured over the frequency range 40Hz–110 MHz and compared to the behavior of a similarly prepared suspension of cells in the absence of α-factor. A s

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Razzaz, Faroq, Saud M. Saeed, and Majeed A. S. Alkanhal. "Ultra-Wideband Bandpass Filters Using Tapered Resonators." Applied Sciences 12, no. 7 (2022): 3699. http://dx.doi.org/10.3390/app12073699.

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In this paper, ultra-wideband bandpass filters using tapered transmission line resonators are presented. The proposed filters are based on short-circuited tapered transmission line stubs. The use of tapered transmission resonators resulted in a noticeable length reduction, a wider controlled operational bandwidth, and better stopband characteristics for filter applications. Three filters are designed with different tapered ratios using exponential tapered transmission line resonators. The other three filters are also designed using equivalent linear tapered transmission line resonators. The de

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Bica, Ioan, and Eugen Mircea Anitas. "Graphene Platelets-Based Magnetoactive Materials with Tunable Magnetoelectric and Magnetodielectric Properties." Nanomaterials 10, no. 9 (2020): 1783. http://dx.doi.org/10.3390/nano10091783.

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We fabricate hybrid magnetoactive materials (hMAMs) based on cotton fibers, silicone oil, carbonyl iron and graphene nanoplatelets (nGr) at various mass concentrations ΦnGr. The obtained materials are used as dielectric materials for manufacturing plane electrical capacitors. The equivalent electrical capacitance Cp and resistance Rp are measured in an electric field of medium frequency f, without and respectively with a magnetic field of magnetic flux density B in the range from 0.1 T up to 0.5 T. The results are used to extract the components ϵr′ and ϵr″ of the complex relative permittivity

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Wang, Zhongbao, and Shaojun Fang. "ANN Synthesis Model of Single-Feed Corner-Truncated Circularly Polarized Microstrip Antenna with an Air Gap for Wideband Applications." International Journal of Antennas and Propagation 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/392843.

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A computer-aided design model based on the artificial neural network (ANN) is proposed to directly obtain patch physical dimensions of the single-feed corner-truncated circularly polarized microstrip antenna (CPMA) with an air gap for wideband applications. To take account of the effect of the air gap, an equivalent relative permittivity is introduced and adopted to calculate the resonant frequency andQ-factor of square microstrip antennas for obtaining the training data sets. ANN architectures using multilayered perceptrons (MLPs) and radial basis function networks (RBFNs) are compared. Also,

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Haq, Tanveerul, and Slawomir Koziel. "Rapid Design Optimization and Calibration of Microwave Sensors Based on Equivalent Complementary Resonators for High Sensitivity and Low Fabrication Tolerance." Sensors 23, no. 2 (2023): 1044. http://dx.doi.org/10.3390/s23021044.

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This paper presents the design, optimization, and calibration of multivariable resonators for microwave dielectric sensors. An optimization technique for the circular complementary split ring resonator (CC-SRR) and square complementary split ring resonator (SC-SRR) is presented to achieve the required transmission response in a precise manner. The optimized resonators are manufactured using a standard photolithographic technique and measured for fabrication tolerance. The fabricated sensor is presented for the high-resolution characterization of dielectric substrates and oil samples. A three-d

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Littman, Nickolas, Steven G. O’Keefe, Amir Galehdar, Hugo G. Espinosa, and David V. Thiel. "Bandwidth control of loop type frequency selective surfaces using dual elements in various arrangements." Flexible and Printed Electronics 6, no. 4 (2021): 045009. http://dx.doi.org/10.1088/2058-8585/ac361a.

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Abstract Frequency selective surfaces (FSSs) have applications across multiple disciplines due to their unique electromagnetic properties. This paper investigates the use of both rounded square loops, and simple loop type dual elements arranged in unique patterns, to control the transmission and reflection bandwidth and resonant frequencies over KU and K frequency bands supported by equivalent circuit models. The FSSs were fabricated using laser engraving to create conductive loop type elements on a thin, flexible and optically transparent Mylar substrate (relative permittivity of 2.7 and thic

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Hamdan, Samia, Ehab K. I. Hamad, Hesham A. Mohamed, and Sherif A. Khaleel. "High-performance MTM inspired two-port MIMO antenna structure for 5G/IoT applications." Journal of Electrical Engineering 75, no. 3 (2024): 214–23. http://dx.doi.org/10.2478/jee-2024-0026.

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Abstract This study thoroughly investigates a two-port multiple-input multiple-output (MIMO) antenna system tailored for 5G operation at 28 GHz. The proposed antenna is patched on a Rogers (RT5880) substrate with a relative permittivity of 2.2 and total size of 20×12×0.508 mm3. The mutual relationship between the radiating patches is refined using an H-shaped metamaterial structure to reduce the isolation to –55 dB. A MIMO configuration with attractive features is employed to reduce the envelope correlation coefficient (ECC) to about 0.00062 and the channel capacity loss (CCL) to about 0.006 b

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Alonso, Rafael, José María García del Pozo, Samuel T. Buisán, and José Adolfo Álvarez. "Analysis of the Snow Water Equivalent at the AEMet-Formigal Field Laboratory (Spanish Pyrenees) During the 2019/2020 Winter Season Using a Stepped-Frequency Continuous Wave Radar (SFCW)." Remote Sensing 13, no. 4 (2021): 616. http://dx.doi.org/10.3390/rs13040616.

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Snow makes a great contribution to the hydrological cycle in cold regions. The parameter to characterize available the water from the snow cover is the well-known snow water equivalent (SWE). This paper presents a near-surface-based radar for determining the SWE from the measured complex spectral reflectance of the snowpack. The method is based in a stepped-frequency continuous wave radar (SFCW), implemented in a coherent software defined radio (SDR), in the range from 150 MHz to 6 GHz. An electromagnetic model to solve the electromagnetic reflectance of a snowpack, including the frequency and

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Tadesse, A. D., O. P. Acharya, and S. Sahu. "A Compact Planar Four-port MIMO Antenna for 28/38 GHz Millimeter-wave 5G Applications." Advanced Electromagnetics 11, no. 3 (2022): 16–25. http://dx.doi.org/10.7716/aem.v11i3.1947.

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This article presents a planar four-port microstrip line-fed Multiple-Input Multiple-Output (MIMO) antenna operating at 5G millimeter-wave candidate bands of 28 GHz and 38 GHz. A rectangular-shaped patch antenna is designed as a main radiator to obtain a resonance at 28 GHz. Etching of a single-element split-ring resonator (SRR) metamaterial unit cell from the basic patch radiator introduces an additional resonance band at 38 GHz. The suggested MIMO antenna is built on Rogers RT5880 substrate material with a dimension of 14 mm × 14 mm, a thickness of 0.8 mm, and a relative permittivity of 2.2.

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Jang, Soo-Ik, Byung-Cheul Choi, and Hyun M. Jang. "Phase-formation kinetics of xerogel and electrical properties of sol-gel-derived BaxSr1−xTiO3 thin films." Journal of Materials Research 12, no. 5 (1997): 1327–34. http://dx.doi.org/10.1557/jmr.1997.0181.

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Chemically homogeneous BaxSr1−xTiO3 (BST with x = 0.6) multicomponent sol was synthesized using barium oxide, strontium chloride, and Ti-alkoxide (titanium isopropoxide) as starting materials. Acetylacetone (AcAc) was introduced as a chelating agent to reduce a rapid hydrolysis rate of Ti-alkoxide. Analysis of Fourier transform infrared spectroscopy (FTIR) spectra indicated that the stabilization of BST sols was achieved by the chelation of Ti-alkoxide with the enolic form of AcAc. The effective activation energy associated with the formation of perovskite phase from the xerogel was estimated

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Mackay, Tom G., and Akhlesh Lakhtakia. "Toward morphologically induced anisotropy in thermally hysteretic dielectric properties of vanadium dioxide." AIP Advances 12, no. 10 (2022): 105026. http://dx.doi.org/10.1063/5.0123882.

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The Bruggeman homogenization formalism was used to numerically investigate the dielectric properties of a columnar thin film (CTF) made from vanadium dioxide. For visible and near-infrared wavelengths, the CTF is electromagnetically equivalent to a homogeneous orthorhombic material. Over the 58–72 °C temperature range, the eigenvalues of the CTF’s relative permittivity dyadic are highly sensitive to temperature and vary according to whether the CTF is being heated or cooled. The anisotropy revealed through the eigenvalues and the anisotropy of the associated hysteresis were investigated in rel

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Hsieh, Gen-Wen, and Chih-Yang Chien. "Wearable Capacitive Tactile Sensor Based on Porous Dielectric Composite of Polyurethane and Silver Nanowire." Polymers 15, no. 18 (2023): 3816. http://dx.doi.org/10.3390/polym15183816.

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In recent years, the implementation of wearable and biocompatible tactile sensing elements with sufficient response into healthcare, medical detection, and electronic skin/amputee prosthetics has been an intriguing but challenging quest. Here, we propose a flexible all-polyurethane capacitive tactile sensor that utilizes a salt crystal-templated porous elastomeric framework filling with silver nanowire as the composite dielectric material, sandwiched by a set of polyurethane films covering silver nanowire networks as electrodes. With the aids of these cubic air pores and conducting nanowires,

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Mirza, Hidayath. "A Planar Multislot Antenna with Backplane for Search and Rescue Applications." International Research Journal of Innovations in Engineering and Technology 09, no. 02 (2025): 01–06. https://doi.org/10.47001/irjiet/2025.902001.

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This study focuses on the development of a lowprofile planar multislot antenna with backplane that was built specifically for the requirements of search and rescue operations. The antenna presented here serve as the primary focus of this investigation. The planar multislot antenna with backplane antenna that are being considered are planned to be constructed on a substrate that is made of polydimethylsiloxane (PDMS). PDMS is selected because of its desired features, which include its durability, flexibility, resistance to water, and adaptability for deployment in demanding environmental circum

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Anjali, M., Kumaran Rengaswamy, Abhishek Ukey, Lincy Stephen, C. V. Krishnamurthy, and V. Subramanian. "Flexible metamaterial based microwave absorber with epoxy/graphene nanoplatelets composite as substrate." Journal of Applied Physics 133, no. 6 (2023): 063105. http://dx.doi.org/10.1063/5.0138171.

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Customization of substrates for the design of metamaterial absorbers gives the user a wide choice of parameters like flexibility, thickness, dielectric constant, etc. Polymer composites are attractive in this regard as they provide a variety of options to fabricate substrates with desirable properties depending on the matrix and filler materials. In this work, flexible polymer nanocomposites with different weight percentages of graphene nanoplatelets (GnP) in epoxy were fabricated and the dielectric characterization was performed. The presence of GnP increased the real part of the dielectric c

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Wang, Ruonan, Yang Fang, Qianxiang Gao, Yong Li, Xihan Yang, and Zhenmao Chen. "Quantitative Visualization of Buried Defects in GFRP via Microwave Reflectometry." Sensors 23, no. 14 (2023): 6629. http://dx.doi.org/10.3390/s23146629.

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Glass fiber-reinforced polymer (GFRP) is widely used in engineering fields involving aerospace, energy, transportation, etc. If internal buried defects occur due to hostile environments during fabrication and practical service, the structural integrity and safety of GFRP structures would be severely undermined. Therefore, it is indispensable to carry out effective quantitative nondestructive testing (NDT) of internal defects buried within GFRP structures. Along with the development of composite materials, microwave NDT is promising in non-intrusive inspection of defects in GFRPs. In this paper

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42

Nepeina, Kseniia, Elena Bataleva, and Pavel Alexandrov. "Electromagnetic Monitoring of Modern Geodynamic Processes: An Approach for Micro-Inhomogeneous Rock through Effective Parameters." Applied Sciences 13, no. 14 (2023): 8063. http://dx.doi.org/10.3390/app13148063.

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This study focuses on microscale anisotropy in rock structure and texture, exploring its influence on the macro anisotropic electromagnetic parameters of the geological media, specifically electric conductivity (σ), relative permittivity (ε), and magnetic permeability (μ). The novelty of this research lies in the advancement of geophysical monitoring methods for calculating cross properties through the estimation of effective parameters—a kind of integral macroscopic characteristic of media mostly used for composite materials with inclusions. To achieve this, we approximate real geological med

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YOSSIFON, G., I. FRANKEL, and T. MILOH. "Macro-scale description of transient electro-kinetic phenomena over polarizable dielectric solids." Journal of Fluid Mechanics 620 (February 10, 2009): 241–62. http://dx.doi.org/10.1017/s002211200800459x.

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We have studied the temporal evolution of electro-kinetic flows in the vicinity of polarizable dielectric solids following the application of a ‘weak’ transient electric field. To obtain a macro-scale description in the limit of narrow electric double layers (EDLs), we have derived a pair of effective transient boundary conditions directly connecting the electric potentials across the EDL. Within the framework of the above assumptions, these conditions apply to a general transient electro-kinetic problem involving dielectric solids of arbitrary geometry and relative permittivity. Furthermore,

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Fomin, D. G., N. V. Dudarev, S. N. Darovskikh, and V. K. Baranov. "The Investigation of the Volumetric Strip-Slot Transition with U-Shaped Slot Resonator." Ural Radio Engineering Journal 4, no. 3 (2020): 277–92. http://dx.doi.org/10.15826/urej.2020.4.3.002.

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The application of volumetric strip-slot transition for the implementationof wireless devices with contactless frequency-selective transmission of microwave signals is relevant. This is due to the compactness of volumetric strip-slot transition achieved by the multilayer arrangement of its functional parts and of its electrical frequency-selective characteristics. At the same time the volumetric-modular design allows the replacement of its individual components which provides high functional flexibility of the device. Reducing of weight and dimensions of the volumetric strip-slot transition wh

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Shihzad, Waleed, Sadiq Ullah, Ashfaq Ahmad, Nisar Ahmad Abbasi, and Dong-you Choi. "Design and Analysis of Dual-Band High-Gain THz Antenna Array for THz Space Applications." Applied Sciences 12, no. 18 (2022): 9231. http://dx.doi.org/10.3390/app12189231.

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In this paper, a high-gain THz antenna array is presented. The array uses a polyimide substrate with a thickness of 10 μm, a relative permittivity of 3.5, and an overall volume of 2920 μm × 1055 μm × 10 μm, which can be employed for THz band space communication and other interesting applications. The dual-band single-element antenna is designed in four steps, while operating at 0.714 and 0.7412 THz with −10 dB bandwidths of 4.71 and 3.13 GHz, providing gain of 5.14 and 5 dB, respectively. In order to achieve a high gain, multiple order antenna arrays are designed such as the 2 × 1 antenna arra

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Horielyshev, Stanislav. "METHOD OF ASSESSMENT OF THE DEGREE OF ELECTROMAGNETIC INTERACTION OF TWO METAL NANOPARTICLES IN THE OPTICAL RANGE OF WAVES." Collection of scientific works of the National Academy of the National Guard of Ukraine" 2, no. 44 (2024): 41–49. https://doi.org/10.33405/2409-7470/2024/2/44/319436.

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A method for calculation the scattering characteristics of a model consisted of several silver nanoparticles, which have a finite dielectric permittivity in the optical band (wavelength from 300 nm to 900 nm) is proposed. Developed numerical method is based on the Muller surface integral equation (IE) set solution for a group of nanoparticles. The values of a total scattering cross-section (TSCS), extinction cross-section (ECS) and absorption cross-section (ACS) were obtained for a model of two nanoparticles of ellipsoidal shape and different sizes (from tens to hundreds of nanometers). Mentio

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Varshney, Atul, Vipul Sharma, Issa Elfergani, Chemseddine Zebiri, Zoran Vujicic, and Jonathan Rodriguez. "An Inline V-Band WR-15 Transition Using Antipodal Dipole Antenna as RF Energy Launcher @ 60 GHz for Satellite Applications." Electronics 11, no. 23 (2022): 3860. http://dx.doi.org/10.3390/electronics11233860.

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This article demonstrates the design and development of WR-15 transition using an antipodal microstrip dipole antenna at a frequency of 60 GHz for space applications. An inline microstrip line to rectangular waveguide (MS-to-RWG) transition is proposed for the V-band (50–75 GHz) functioning. The RF energy is coupled and launched through an antipodal dipole microstrip antenna. Impedance matching and mode matching between the MS line and dipole are achieved by a quarter wave impedance transformer. This results in the better performance of transitions in terms of insertion loss (IL > −0.50 dB)

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Sachkov, I. N. "On the Concentration of External Electric Field Intensity on the Internal Surfaces of Blood Vessels." MEDICAL RADIOLOGY AND RADIATION SAFETY 70, no. 1 (2025): 60–66. https://doi.org/10.33266/1024-6177-2025-70-1-60-66.

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Purpose: To show that connective tissue forming the inner surfaces of blood vessels can act as a concentrator of an external electric field. Material and methods: Previously, when studying the effects of electromagnetic fields and radiation on the human body, the SAR calculation method and the experimental method of tissue-equivalent phantom dummies were used. Their implementation usually assumed that the absorbing medium is homophase. At the same time, the effects associated with the fact that biological tissue is a mixture of components whose permittivities differ by tens of times, and the p

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Karnajit Singh, Hodam, Prajna P. Mohapatra, Subingya Pandey, and Pamu Dobbidi. "Unlocking the potential of hexaferrite–spinel ferrite composites: Microstructure-induced colossal permittivity and relaxation phenomena." Journal of Applied Physics 134, no. 19 (2023). http://dx.doi.org/10.1063/5.0168293.

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The solid-state synthesized dense ceramic composite, consisting of M-type hexaferrite Ba0.5Sr0.5Fe12O19 and inverse spinel ferrite Ni0.3Co0.2Zn0.5Fe2O4 (NCZFO) with varying concentrations, demonstrates the presence of apparent colossal permittivity along with dielectric relaxation behaviors at the higher frequency regions for all the composites. This phenomenon manifests as a giant dielectric permittivity of approximately 105 at 1 kHz, gradually decreasing to around 103 at 1 MHz at room temperature. It can be attributed to the Maxwell–Wagner interfacial polarization, which arises from the pres

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Ramírez-González, Julia, Derek Clark Sinclair, and Anthony Roy West. "Impedance and Dielectric Spectroscopy of Functional Materials: A Critical Evaluation of the Two Techniques." Journal of The Electrochemical Society, November 6, 2023. http://dx.doi.org/10.1149/1945-7111/ad09fa.

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Abstract Impedance and dielectric spectroscopies are closely-related techniques for measuring electrical properties of materials. The techniques differ in two ways. First, impedance measurements are usually made over several decades of frequency (ie broadband) whereas most dielectric measurements are made at fixed frequency. Second, time constants that control semicircles in impedance complex plane plots and peaks in permittivity or tan δ spectroscopic plots are not the same. In impedance data, time constants represent conducting components and parallel resistance-capacitance (RC) combinations

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