scholarly journals Design of Substrate-Integrated Waveguide Loading Multiple Complementary Open Resonant Rings (CSRRs) for Dielectric Constant Measurement

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 857 ◽  
Author(s):  
Honggang Hao ◽  
Dexu Wang ◽  
Zhu Wang
Keyword(s):  
Dielectric Constant ◽  
Quality Factor ◽  
Ground Plane ◽  
Resonant Cavity ◽  
Frequency Offset ◽  
Dielectric Constants ◽  
Complex Dielectric Constant ◽  
Cavity Method ◽  
Substrate Integrated Waveguide ◽  
Wide Range

In order to solve the low-sensitivity problem of the dielectric constant with the resonant cavity method, a sensor based on a substrate-integrated waveguide structure loaded with a multi-complementary open resonant ring is proposed. With the enhanced resonance characteristics of the sensor, this design realized the measurement of complex dielectric constants in a wide range. The frequency selectivity of the sensor is improved by the high-quality factor of the substrate-integrated waveguide. By loading three complementary resonant rings with different opening directions in the ground plane, a deeper notch and better out-of-band suppression are achieved. The effect of the complex dielectric constant on both resonant frequency and quality factor is discussed by calculating the material under test with a known dielectric constant. Simulation and experimental results show that a resonance frequency offset of 102 MHz for the per unit dielectric constant is achieved. A wide frequency offset is the prerequisite for accurate measurement. The measurement results of four plates match well with the standard values, with a relative error of the real part of the dielectric constant of less than 2% and an error of less than 0.0099 for the imaginary part.

In—Line Measurement Of High Temperature Dielectric Constant In The Process Of Sintering

1996 ◽  
Vol 430 ◽  
Author(s):  
Zhou Jian ◽  
Cheng Jiping ◽  
Tang Yuling ◽  
Qiu Jinyu
Keyword(s):  
Dielectric Constant ◽  
High Temperature ◽  
Resonant Cavity ◽  
Ceramic Materials ◽  
Dielectric Constants ◽  
Experimental Results ◽  
Cavity Method ◽  
Experimental Basis ◽  
Ceramic Samples ◽  
Line Measurement

AbstractIn this paper, a resonant cavity method is developed and some experimental results for measuring dielectric constants of ceramic samples (e. g. Al2O3) under different sintering temperatures are reported. The experiments show that this method has higher precision and good prospects of in—line monitoring the high temperature dielectric constant in the process of raising the temperature of the samples. These results provide some scientific experimental basis for physical research of ceramic materials.

Dielectric Property of PZT Thin Films Doped with PMnN

2012 ◽  
Vol 569 ◽  
pp. 35-38
Author(s):  
Tao Zhang ◽  
Min Li ◽  
Ting Liu ◽  
Bin Sun ◽  
Sheng Nan Zhou
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Dielectric Property ◽  
Quality Factor ◽  
Mechanical Quality Factor ◽  
Dielectric Constants ◽  
Pzt Thin Films ◽  
Testing Frequency ◽  
Mechanical Quality ◽  
Doping Ratio

The high piezoelectricity and high mechanical quality factor thin films are very important for the fabrications of micro devices. The Pb(Zrx,Ti1-x)O3(PZT) thin films own high piezoelectricity, however, its mechanical quality factor is small. The proper doping of Pb(Mn1/3,Nb2/3)O3(PMnN) will perfectly improve the mechanical quality of the films. However, the doping of PMnN will change the dielectric property of PZT thin films, and so it’s very necessary to investigate the dielectric property of PZT thin films doped with different ratio of PMnN. In this paper, the Pb(Mn1/3,Nb2/3)O3- PbZrO3-PbTiO3(PMnN-PZT) thin films with different doping ratio of PMnN are deposited by the magnetron sputtering method, and the X-ray diffraction is applied to analyze the structure of thin films, and the relative dielectric constant are characterized by the LCR testing system. The results show that the PMnN-PZT thin films with smaller doping ratio than 20% exhibit polycrstal structure, and the dielectric constant of thin films increase with the doping ratio of PMnN sharply, especially the doped PMnN is smaller than 6 mol percent. All the dielectric constants decrease with the testing frequency, and which have little change if the testing frequency is larger than 2.5kHz.

THE COMPLEX DIELECTRIC CONSTANT OF SOLUTIONS OF TRIMETHYLPENTANE AND NITROBENZENE NEAR THE CONSOLUTE TEMPERATURE

1961 ◽  
Vol 39 (3) ◽  
pp. 526-534 ◽  
Author(s):  
B. D. Ripley ◽  
R. McIntosh
Keyword(s):  
Dielectric Constant ◽  
Phase Separation ◽  
Standing Wave ◽  
Applied Field ◽  
Coaxial Line ◽  
Dielectric Constants ◽  
Complex Dielectric Constant ◽  
Experimental Procedure ◽  
Chemical Systems ◽  
Consolute Temperature

The complex dielectric constants of three compositions of trimethylpentane and nitrobenzene have been measured as a function of temperature for a range near the consolute temperature. The frequency employed was 3300 Mc/sec. The experimental procedure involved the study of the standing wave established in a coaxial line. The chemical systems showed maxima in both the real and imaginary parts of the complex dielectric constant at temperatures above those at which phase separation occurs. The finding of Semenchenko and Azimov is thus confirmed. A discussion of the validity of applying thermodynamic formulae to dielectrics showing loss is given and some qualitative remarks are offered concerning the change of the systems as they are cooled. These remarks are based upon the effect of the applied field upon the entropy of the solutions.

Microwave properties of drilling fluids

Geophysics ◽  
1981 ◽  
Vol 46 (3) ◽  
pp. 322-332 ◽  
Author(s):  
James N. Lange ◽  
Steven S. Shope
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Weight Percent ◽  
Dielectric Constants ◽  
Drilling Fluids ◽  
Nanosecond Pulses ◽  
Microwave Attenuation ◽  
In Situ Conditions ◽  
Wide Range

The application of electromagnetic (EM) techniques to well logging is initiated in an environment dominated by the properties of the drilling fluids. An impulse technique using nanosecond pulses is applied to a coaxial waveguide containing drilling fluids to measure the velocity (dielectric constant ε) and absorption (attenuation coefficient α) of EM impulses. It is the large difference in dielectric constants of water and oil which makes EM propagation techniques attractive for logging. Dielectric properties of some nondispersed drilling fluids (bentonite and attapulgite clays) are found to be largely dependent upon the volume of water present. Both bentonite and attapulgite clays exhibit the same range of dielectric constants (ε = 81 → 75) when the weight percent of clay is increased to 10 percent. In contrast, the microwave attenuations of these two clays are quite different, with that of the bentonite increasing at about 4 times the rate of the attapulgite suspensions. Microwave attenuation measured for a variety of commercial drilling fluids varies over a wide range, with the lignosulfonates the largest (91 dB/m) and oil inverts the smallest (3 dB/m). The oil inverts also have a small dielectric constant (ε = 3 → 6). Temperature dependence of the attenuation for these same drilling fluids is determined in the range from 23 °C to 45 °C to indicate their behavior under in situ conditions.

Investigation on dielectric properties of the polyetherketone nanocomposite with lead titanate ultrafines

2001 ◽  
Vol 79 (5) ◽  
pp. 847-855 ◽  
Author(s):  
W Shi ◽  
C Fang ◽  
S Guo ◽  
Q Ren ◽  
Q Pan ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Constants ◽  
Inorganic Nanoparticles ◽  
Complex Dielectric Constant ◽  
Nanocomposite Polymer ◽  
Local Field Theory ◽  
Constant Expression ◽  
Space Polarization ◽  
Good Agreement

The dielectric properties of polymer composites with inorganic nanoparticles were investigated. In the demonstration of the dielectric constant expression of the nanocomposite polymer, the dielectric contributions of the displacement polarization, the orientation polarization, and the space polarization in the nanocomposite polymer were all considered. In the demonstration, two dielectric relaxation models were used, that of Debye for inorganic nanoparticles and the Havriliak–Negami function model for polymers. Then the expression of the complex dielectric constant of the nanocomposite polymer was obtained by using Onsager's local field theory. Furthermore, the nanocomposite polymer thin films that consist of PbTiO3 nanoparticles and polyetherketone were prepared. The real parts of the dielectric constants were measured and calculated, respectively. It was found that our calculated results are in good agreement with our measured results. PACS Nos.: 77.20, 77.55, 81.20T

Preparation and Properties of Polyisoimides as a Highly Dimensionally Stable Polyimide Precursor with Low Dielectric Constant

1997 ◽  
Vol 9 (3) ◽  
pp. 333-344 ◽  
Author(s):  
Hiroshi Seino ◽  
Osamu Haba ◽  
Amane Mochizuki ◽  
Masahiro Yoshioka ◽  
Mitsuru Ueda
Keyword(s):  
Dielectric Constant ◽  
Dielectric Constants ◽  
Isomerization Reaction ◽  
Low Dielectric Constant ◽  
Low Dielectric ◽  
Fluorinated Polyimides ◽  
Wide Range ◽  
Biphenyltetracarboxylic Dianhydride ◽  
Polyimide Precursor ◽  
Dipolar Aprotic Solvents

Fluorinated polyimides (PIs) with low dielectric constant and high dimensional stability have been developed using polyisoimides (PIIs) as a polyimide precursor. The PIIs were prepared by the ring-opening polyaddition of the dianhydrides pyromellitic dianhydride, biphenyltetracarboxylic dianhydride and 4, 4′-hexafluoropropylidenedi(phthalic anhydride) with the diamines 2, 2′-dimethylbenzidine and 2, 2′-bis(trifluoromethyl)benzidine, followed by treatment with trifluoroacetic anhydride/triethylamine or dicyclohexylcarbodiimide in N;N-dimethylacetamide. The PIIs were soluble in a wide range of solvents including dipolar aprotic solvents, cyclohexanone and tetrahydrofuran at room temperature, and easy to convert to corresponding PIs by high thermal treatment. The resulting PIs showed low dielectric constants of less than 3 at 1 MHz as well as low CTEs. Furthermore, during the isomerization reaction, migration of copper in the PI film was hardly observed.

scholarly journals Effects of Oxygen Ion Irradiation on PZT Modified Ferroelectric Materials for Space Applications

2016 ◽  
Vol 1 (1) ◽  
Keyword(s):  
Dielectric Constant ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Ferroelectric Material ◽  
Pyroelectric Coefficient ◽  
Ferroelectric Materials ◽  
Dielectric Constants ◽  
Space Applications ◽  
Oxygen Ion ◽  
Wide Range

Lead magnesium niobate-lead titanate (PMN-PT) is an important and high performance piezoelectric and pyroelectric relaxor material having wide range of applications in infrared sensor devices. Present work studies the fabrication and dielectric characteristics of PMN-PT in the bulk form. The PMN-PT bulk material was prepared in sol-gel method and subsequently irradiated with heavy ion oxygen. The materials were analyzed and determined that the relaxor ferroelectric material indicated changes in its dielectric constant and pyroelectric coefficient after irradiation. Due to the radiation fluent of 1×1016 ions/cm2 , the dielectric constant of the material increased uniformly, while its pyroelectric coefficient showed a sharp increased to the value of 5×10-9 μC/cm2 °C with increase in temperature. Its dielectric constants showed increase in values of 527 μC/cm2 °C at 50°C, 635 μC/ cm2 °C at 60°C and 748 μC/cm2 °C at 70°C. Properties such as the material impedance, admittance and modulus were investigated for changes in properties which became evident after irradiation. In this paper effect of oxygen ion irradiation on the LiTaO3 and two commercial samples BM 300 and BM 941 are also reported and analyzed. All these bulk materials were functional even after irradiation and was showing enhancement in some of the key characteristics of ferroelectric material.

High Performance Porous Wave-Transmitting Silicon Nitride Ceramics by Gel-Casting Technique

2012 ◽  
Vol 512-515 ◽  
pp. 869-872 ◽  
Author(s):  
Jian Zhang ◽  
Ji Wei Chen ◽  
Hong Jie Wang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Flexural Strength ◽  
High Performance ◽  
Sintering Temperature ◽  
Resonant Cavity ◽  
Porous Ceramics ◽  
Cavity Method ◽  
Pore Former ◽  
Gel Casting

Porous wave transmitting Si3N4 ceramics have been of great interest and technological importance in aerospace area. In this paper, the high performance wave transmitting porous Si3N4 ceramics was prepared by gel-casting method, without any pore-former. The porosity was controlled by the solid content of the slurry and the sintering temperature. The flexural strength and dielectric properties of the material were determined by three bending method and a resonant cavity method. The relationship of the dielectric constant versus the sintering temperature was discussed, and the effect of porosity on dielectric properties was investigated also. As a result, the flexural strength of the porous Si3N4 is 40-200MPa with porosity of 67-45%, dielectric constant of 2.2-3.4 in the frequency of 8GHz at room temperature. With the increase of porosity, both the dielectric constant and dielectric loss decreased. This technique is considered to be a potentially useful method to fabricate the porous ceramics with complex shape.

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