Showing papers on "Relative permittivity published in 1968"
TL;DR: In this paper, an analytical program for calculating the field distribution about a microstrip transmission line bounded by a shielding wall is used to calculate the impedance, velocity, and attenuation parameters.
Abstract: An analytical program for calculating the field distribution about a microstrip transmission line bounded by a shielding wall is used to calculate the impedance, velocity, and attenuation parameters. The program input parameters are the dimensions of the strip and shielding wall and the relative dielectric constant of the substrate material. The field distribution about the strip is integrated to find the charge density on the strip and walls with and without the dielectric substrate. From these two calculations, the relative velocity and impedance can be calculated.
63 citations
TL;DR: In this article, the theoretical analysis of the temperature coefficient of capacitance of most insulators is outlined and it is shown that, for given ranges of permittivity, the analysis can be greatly simplified.
Abstract: The temperature coefficient of capacitance (TCC) of most insulators is dominated by five components. The theoretical analysis of these components is outlined and it is shown that, for given ranges of permittivity, the analysis can be greatly simplified. This simplified treatment is shown to apply to widely different types of compound. Since TCC depends on permittivity, the permittivity of a variety of materials has been rationalized by reference to their `I' factor, which is defined as mean atomic number per cubic angstrom.
58 citations
TL;DR: In this article, the relative dielectric constant er of high resistivity GaAs has been measured at 70.243 GHz as a function of temperature between 100 and 300°K.
Abstract: The relative dielectric constant er of high‐resistivity GaAs has been measured at 70.243 GHz as a function of temperature between 100 and 300°K. The measuring technique utilized a circular E field (TE°01) mode reflection‐coefficient bridge. Estimated relative and absolute accuracies of the measurements are ±0.2% and ±0.5%, respectively. The results are found to fit the equation er(T) = er(0){1 + αT} where er(0) = 12.73 ±.07 and α = (1.2 ± 0.1) × 10−4. At room temperature (295°K) the relative permittivity is er = 13.18 ±.07.
30 citations
TL;DR: In this paper, a tabulation of relative dielectric constant and loss tangent is presented for a number of common materials, using an interference spectrometer to measure insertion loss and phase shift.
Abstract: A tabulation of relative dielectric constant and loss tangent is presented for a number of common materials. Measurements were made by using an interference spectrometer to measure insertion loss and phase shift of dielectric samples.
29 citations
TL;DR: In this paper, the complex relative permittivity of liquids using coaxial line apparatus was measured over a wide range of frequency and temperature. Butts and Hinton describe a cell consisting of a section of short-circuited line with a detector probe projecting from the inner conductor.
Abstract: Methods are described for measuring the complex relative permittivity e=e′−e″ of liquids using coaxial line apparatus. The determinations can be carried out over a wide range of frequency and temperature. A description is given of a cell consisting of a section of short‐circuited line with a detector probe projecting from the inner conductor. By use of a computer, values of e′ and e″ may be obtained for liquids having attenuation coefficients extending over a considerable range.
26 citations
19 Nov 1968
TL;DR: In this paper, a Debye type dispersion was suggested for each of the three relaxing polar components in the solutions: the solute, the water of normal structure and water with structure modified by the presence of a solute.
Abstract: Measurements of the complex permittivity of one, two and three molar ɛ -aminocaproic acid solutions have been made in the frequency range 70 to 2000 Mc/s and at temperatures between 10 and 40°C. The central regions of very large dispersions are revealed with falls in permittivity ɛ 9 and maximum values of loss factor ɛ " considerably larger than in pure water. An interpretation is suggested in terms of a Debye type dispersion for each of three relaxing polar components in the solutions: the solute, the water of normal structure and water with structure modified by the presence of the solute.
18 citations
TL;DR: In this article, the authors reported microwave (70.2 GHz) measurements of the relative permittivity er of high resistivity GaAs in the temperature range between 100° and 300°K.
Abstract: An earlier letter reported microwave (70.2 GHz) measurements of the relative permittivity er of high‐resistivity GaAs in the temperature range between 100° and 300°K. This letter extends the measurements to 600°K. Over the entire temperature range 100° < T < 600°K, the permittivity is observed to fit the expression er(T) = er(0){1 + αT}, where er(0) = 12.79 ± 0.10 and α = 1.0 × 10−4 deg−1.
16 citations
TL;DR: An analytical program for calculating the field distribution about a microstrip transmission line bounded by a shielding wall is used to calculate the impedance, velocity, and attenuation parameters.
Abstract: An analytical program for calculating the field distribution about a microstrip transmission line bounded by a shielding wall is used to calculate the impedance, velocity, and attenuation parameters. The program input parameters are the dimensions of the strip and shielding wall and the relative dielectric constant of the substrate material. The field distribution about the strip is integrated to find the charge density on the strip and walls with and without the dielectric substrate. From these two calculations, the relative velocity and impedance can be calculated.
10 citations
TL;DR: In this paper, an analytical program for calculating the field distribution about a microstrip transmission line bounded by a shielding wall is used to calculate the impedance, velocity, and attenuation parameters.
Abstract: An analytical program for calculating the field distribution about a microstrip transmission line bounded by a shielding wall is used to calculate the impedance, velocity, and attenuation parameters. The program input parameters are the dimensions of the strip and shielding wall and the relative dielectric constant of the substrate material. The field distribution about the strip is integrated to find the charge density on the strip and walls with and without the dielectric substrate. From these two calculations, the relative velocity and impedance can be calculated.
4 citations
TL;DR: In this paper, the authors measured the permittivity by impedance measurement on thin cylindrical samples placed in an ordinary rectangular waveguide and in a cavity formed by an ordinary coaxial transmission line.
Abstract: Permittivity is measured by impedance measurement on thin cylindrical samples placed in an ordinary rectangular waveguide and in a cavity formed by an ordinary coaxial transmission line. The first method does not depend on resonance and is characterized by a rather high accuracy. The second, more conventional method, is used in conjunction with the first for study of dc bias dependence of the permittivity.
2 citations
TL;DR: In this article, the results of complex permittivity measurements of triglycine sulphate at large electric field amplitudes (36.6 V/m−386 kV/m) and a frequency of 20 kHz in a temperature range including the Curie temperature (22-53°C).
Abstract: The paper gives the results of complex permittivity measurements of triglycine sulphate at large electric field amplitudes (36.6 V/m−386 kV/m) and a frequency of 20 kHz in a temperature range including the Curie temperature (22–53°C). An experimental arrangement for measuring by means of the pulse method is described which was used in order to prevent heating of the sample due to dielectric losses. The relations established between the permittivity and the amplitude of the electric field and temperature are in good qualitative agreement with the corresponding results obtained by calculation in the paper of J. Fousek [J. Appl. Phys. 36 (1965), 588].
01 Jun 1968
TL;DR: In this paper, the attenuation coefficient of a coaxial cable was investigated for the case of a dielectric whose permittivity is a linear function of radius, and it was shown that a decrease in attenuation is possible if the ratio of the outer conductor radius to the wavelength is large enough, and if the permittivities increases with increasing radius.
Abstract: Barlow has suggested that the attenuation coefficient of a coaxial cable might be reduced by a suitable dielectric loading. This suggestion is studied for the case of a dielectric whose permittivity is a linear function of radius. It is found that a decrease in attenuation is possible if the ratio of the outer conductor radius to the wavelength is large enough, and if the permittivity increases with increasing radius. No decrease is possible if the permittivity decreases with increasing radius.
01 Oct 1968
TL;DR: A survey of several materials as discussed by the authors indicated that fluorinated ethylene copolymer (FEP) is a satisfactory material for standard reference specimens for relative dielectric constant (e'), and that FEP is a suitable material for a variety of applications.
Abstract: A survey of several materials1 indicated that fluorinated ethylene — propylene copolymer (FEP) is a satisfactory material for standard reference specimens for relative dielectric constant (e').
TL;DR: In this article, experimental data for the low-frequency dependences of effective resistivity, permittivity and dielectric losses in ferrites are given for a generalized barrier model.
Abstract: Experimental data are given for the low-frequency dependences of effective resistivity, permittivity and dielectric losses in ferrites. Discussion is based on a generalized barrier model.