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Method and apparatus for measuring complex dielectric constant of dielectric

A dielectric constant and dielectric technology, which is applied in the field of high-precision measurement of the complex dielectric constant of dielectrics, can solve the problems of measuring the dielectric constant of powdery dielectrics, floating capacitance and floating reactance cannot be ignored, and cannot be used.

Inactive Publication Date: 2004-10-06
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, in the conventional method of measuring the dielectric constant of powdery dielectrics, in the case of measuring the dielectric constant of powdery dielectrics in a high-frequency band of several GHz or more, the existence of floating capacitance and floating reactance cannot be ignored
As a result, there is a problem that the entire measuring device resonates and cannot measure the dielectric constant of powdery dielectrics with high precision
Moreover, a viable method for measuring the dielectric loss tangent in the complex permittivity of powdered dielectrics, as desired, is generally not known
[0011] On the other hand, although cylindrical dielectric moldings can be easily produced depending on the type of dielectric, it is difficult to produce thin rod or sheet-shaped dielectric moldings
Therefore, there is a problem that the complex permittivity of the dielectric cannot be measured by the perturbation method or the cavity resonator method
On the other hand, in the dielectric resonator method capable of measuring cylindrical dielectric moldings, there is a problem that the dielectric constant and dielectric loss tangent cannot be measured in a dielectric having a low dielectric constant among complex dielectric constants such as resin. question

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  • Method and apparatus for measuring complex dielectric constant of dielectric
  • Method and apparatus for measuring complex dielectric constant of dielectric
  • Method and apparatus for measuring complex dielectric constant of dielectric

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no. 1 approach

[0122] A first embodiment of the apparatus and method for measuring the complex permittivity of a dielectric according to the present invention will be described in detail below. In this embodiment, a cavity resonator is used as the mode generator shown in FIG. 1 .

[0123] 2 is a block diagram showing a measuring device for performing a method for measuring a complex permittivity of a dielectric according to the present embodiment, FIG. 3 is a schematic perspective view showing a cavity resonator, and FIG. 4 is a Fig. 3 is a schematic cross-sectional view of a cavity resonator along line X-X, showing a powdered dielectric as a dielectric.

[0124] As shown in Figure 2, the measurement device 12 includes a cavity resonator 14, a network analyzer 16, and a computing device 18, which respectively correspond to the mode generator 2, the electromagnetic wave generation analyzer 3, and the computing device 4 in Figure 1 . More specifically, the measurement device 12 according to ...

no. 2 approach

[0247] The second embodiment of the apparatus and method for measuring the complex permittivity of a dielectric according to the present invention will be described in detail below. In this embodiment, waveguides are used as the mode generators shown in FIG. 1 .

[0248] FIG. 7 is a block diagram showing the structure of the measuring device according to the present embodiment, and FIGS. 8-10 are views each showing a waveguide.

[0249] As shown in FIG. 7 , a dielectric characteristic measurement device 200 includes a waveguide device 201 and a measurement device 202 .

[0250] The waveguide device 201 is used as the mode generator shown in FIG. 1, and is composed of the waveguides 210, 220 and 230 shown in FIGS. 8-10 to propagate so-called electromagnetic waves.

[0251] The waveguide 210 shown in FIG. 8 is of a so-called coaxial type, and is composed of a cylindrical outer conductor 211 having an inner portion as a cavity, and a cylindrical center conductor 212 provided coa...

Embodiment 1

[0278] Prepared a density of 3.99g / cm 3 and powdered Al with an average particle size of 9.8 μm 2 o 3 The sample A, the density is 3.99g / cm 3 and powdered Al with an average particle size of 17.8 μm 2 o 3 sample B, and a density of 3.99g / cm3 and powdered Al with an average particle size of 134.7 μm 2 o 3 Sample C of

[0279] Using the measuring device 12 shown in FIG. 2 as the measuring device, the sample A was filled in the closed space formed in the cavity resonator 14 so as to have a volume ratio of 0.39, and measured in a vacuum by mixing the sample A with air The dielectric constant and dielectric loss tangent of the mixture layer 118 are obtained.

[0280] First, the second piston 140 is inserted into the through hole 116 having a diameter of 16 mm formed on the cavity resonator 14 from below, and is positioned and fixed by the screw 134b. Also, the first piston 120 is inserted into the through hole 116 from above, and is positioned so that the thickness L of the...

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Abstract

An electromagnetic wave is input to a resonator 14 filled with a dielectric and a gas, and a resonance frequency, an insertion loss and a half-power width in the resonance mode of the electromagnetic wave output from the resonator 14 are measured by a network analyzer 16 in response to the input of the electromagnetic wave and the complex dielectric constant of the dielectric is calculated from the resonance frequency, the insertion loss and the half-power width which are thus measured.

Description

technical field [0001] The present invention relates to a method and an apparatus for measuring the complex permittivity of a dielectric, and more particularly to a method and apparatus capable of measuring the complex permittivity of a dielectric with high precision. Background technique [0002] With the improvement of the performance of various radio devices, a ceramic dielectric for high frequency having high performance in a high frequency band of several GHz or more has been demanded. Generally, ceramic dielectrics have been used as circuit components in the form of fired products obtained by firing powdery dielectrics. Also, composite dielectrics obtained by mixing powdery dielectrics and resins in various ratios have also been used as circuit components. [0003] Therefore, in order to develop ceramic dielectrics for high frequencies, it is essential to measure the complex permittivity of the dielectric as the dielectric characteristics of the dielectric correspondi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26G01N22/00H01P7/06
CPCH01P7/06G01N22/00E03D9/08
Inventor 江畑克史
Owner TDK CORPARATION