scholarly journals RF-Characterization of HZO Thin Film Varactors

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 980
Author(s):  
Sukhrob Abdulazhanov ◽  
Quang Huy Le ◽  
Dang Khoa Huynh ◽  
Defu Wang ◽  
Maximilian Lederer ◽  
...  
Keyword(s):  
Thin Film ◽  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Electric Field ◽  
Zirconium Oxide ◽  
Electric Field Distribution ◽  
Frequency Range ◽  
Microwave Characterization ◽  
Reflectivity Method

A microwave characterization at UHF band of a ferroelectric hafnium zirconium oxide metal-ferroelectric-metal (MFM) capacitors for varactor applications has been performed. By using an impedance reflectivity method, a complex dielectric permittivity was obtained at frequencies up to 500 MHz. Ferroelectric Hf0.5Zr0.5O2 of 10 nm thickness has demonstrated a stable permittivity switching in the whole frequency range. A constant increase of the calculated dielectric loss is observed, which is shown to be an effect of electric field distribution on highly resistive titanium nitride (TiN) thin film electrodes. The C-V characteristics of a “butterfly” shape was also extracted, where the varactors exhibited a reduction of capacitance tunability from 18.6% at 10 MHz to 15.4% at 500 MHz.

scholarly journals Design and Characterization of a Microwave Planar Sensor for Dielectric Assessment of Vegetable Oils

Electronics ◽  
2019 ◽  
Vol 8 (9) ◽  
pp. 1030 ◽  
Author(s):  
Aleksandr Ivanov ◽  
Timur Agliullin ◽  
Dario Laneve ◽  
Vincenza Portosi ◽  
Artem Vorobev ◽  
...  
Keyword(s):  
Dielectric Permittivity ◽  
Electric Field ◽  
Numerical Simulations ◽  
Vegetable Oils ◽  
Experimental Validation ◽  
Experimental Results ◽  
Geometrical Parameters ◽  
Frequency Range ◽  
Simulation Results

We report on the numerical simulations and experimental validation of a microwave planar sensor based on two coupled rings operating in the 4–6 GHz range. The fabricated sensor is used to characterize the dielectric permittivity of vegetable oils. We optimized the geometrical parameters in order to improve the overlap between the oil samples under study and the electric field. The experimental results showed an excellent match with the simulation results. The fabricated sensor allowed to retrieve the oil permittivity with a sensitivity of about 35 MHz per permittivity unit in the frequency range of interest. This paves the way to the realization of compact and sensitive sensors for a wide plethora of fields ranging from industry and food to chemistry and biology.

scholarly journals Смена знака магнитоемкости в парамагнитной области в катион-замещенном селениде марганца

2018 ◽  
Vol 60 (4) ◽  
pp. 670
Author(s):  
С.С. Аплеснин ◽  
М.Н. Ситников ◽  
А.М. Живулько
Keyword(s):  
Magnetic Field ◽  
Solid Solution ◽  
Magnetic Susceptibility ◽  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Room Temperature ◽  
Frequency Range ◽  
Wagner Model ◽  
Paramagnetic Region ◽  
Orbital Electron

AbstractThe capacity and the dielectric loss tangent of a Gd_ x Mn_1– x Se ( x ≤ 0.2) solid solution have been measured in the frequency range 1–300 kHz without a magnetic field and in a magnetic field of 8 kOe in the temperature range 100–450 K, and the magnetic moment of the solid solution has been measured in a field of 8.6 kOe. The magnetocapacity effect and the change in the magnetocapacity sign have been observed in room temperature in the paramagnetic region. A correlation of the changes in the dielectric permittivity and the magnetic susceptibility with temperature has been revealed. The magnetocapacity is described using the model with orbital electron ordering and the Maxwell–Wagner model.

Dielectric Properties of Eucalyptus urophylla Under an Ultra-Wide Frequency Range

2020 ◽  
Vol 12 (8) ◽  
pp. 1236-1241
Author(s):  
He Xia ◽  
Wang Yong ◽  
Li Yunyan ◽  
Wei Yanqiang ◽  
Quan Peng ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Loss Factor ◽  
Wide Frequency Range ◽  
Dielectric Loss Factor ◽  
Regression Equations ◽  
Eucalyptus Urophylla ◽  
Frequency Range ◽  
Tangential Directions

Dielectric properties of Eucalyptus urophylla wood were measured by using a network analyzer over an ultrawide frequency range between 0.2 GHz and 20 GHz. The effects of moisture content (MC), temperature and frequency on the dielectric permittivity and the dielectric loss factor of Eucalyptus urophylla were investigated along different grain directions. The results showed that the dielectric permittivity along with the dielectric loss factor increased significantly with the elevation in MC. At the frequency of 2380 MHz with the MC increasing from 0% to 100%, the dielectric permittivity along different grain directions (including longitudinal, radial and tangential directions) increased by 180%, 110% and 112%, respectively, while the loss factor along these three directions increased by 1642%, 3703% and 5058%, respectively. In addition, the increase in dielectric properties of Eucalyptus urophylla wood was determined with the temperature elevating. When the temperature elevated from 20 °C to 140 °C, the dielectric permittivity at 2380 MHz along the longitudinal, radial and tangential directions, increased by 19%, 14% and 15%, respectively, while the loss factor increased by 133% at most. As the radio frequency increased, the dielectric permittivity of wood decreased. Regression equations satisfactorily described the dielectric properties of wood along different grain directions with different moisture contents.

Experimental Characterization of the Electric Field Distribution Induced by TMS Devices

2015 ◽  
Vol 8 (3) ◽  
pp. 582-589 ◽  
Author(s):  
Jaakko O. Nieminen ◽  
Lari M. Koponen ◽  
Risto J. Ilmoniemi
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Experimental Characterization

Frequency Band Rejection Technique Based on the Operating Modes for a Wideband H-Shaped DRA

2021 ◽  
Vol 36 (2) ◽  
pp. 168-173
Author(s):  
Feras Abushakra ◽  
Nathan Jeong
Keyword(s):  
Electric Field ◽  
Frequency Band ◽  
Electric Field Distribution ◽  
Dielectric Resonator Antenna ◽  
Frequency Range ◽  
New Approach ◽  
Feeding Method ◽  
Operating Modes ◽  
Operating Frequency Range ◽  
Conductive Strip

In this paper, a new approach to create frequency band rejection is applied to a wideband H-shaped dielectric resonator antenna (DRA). In order to create a notch characteristic in the operating band of the TEy1δ1 and TEy2δ1 modes, and guided by their theoretical and simulated electric field distributions, a narrow conductive strip is incorporated around the mid-section of the H-shaped DRA. The orientation of the notching strip is determined based on the electric field distribution of the selected modes for the frequency rejection. Furthermore, the selected feeding method improves the radiation patterns for this DRA shape compared to its previous designs. The new design offers an operating frequency range that extends from 4.15 to 9.8 GHz, allowing 81% of fractional bandwidth. The first notch is created at 6.5 GHz, while the second one is at 8 GHz. Average radiation efficiency of 95% across the frequency of interest is achieved with overall dimensions of 40x30x11.4 mm3. The proposed design is simulated using Ansys HFSS and validated by measurement.

Mechanisms of Dielectric Loss in Microwave Materials

1999 ◽  
Vol 603 ◽  
Author(s):  
Alexander Tagantsev
Keyword(s):  
Experimental Data ◽  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Electric Field ◽  
Present Knowledge ◽  
Theoretical Knowledge ◽  
Intrinsic Loss ◽  
Dc Electric Field ◽  
Microwave Materials ◽  
Loss Mechanisms

AbstractThe present knowledge on mechanisms for dielectric loss at microwave and higher frequencies is reviewed. A special attention is paid to the intrinsic loss mechanisms. Relation between the loss and the dielectric permittivity as well as the effect of dc electric field on the loss are discussed. The theoretical knowledge is compared to the existing experimental data.

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