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Coaxial-dielectric circular waveguide resonant cavity with frequency range of 1GHz-8GHz and dielectric parameter testing method

A test method and technology of dielectric parameters, applied to resonators, waveguide devices, circuits, etc., can solve problems such as complex calculations, elevation, and measurement deviations

Inactive Publication Date: 2014-01-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The former, due to the fit gap between the sample and the inner and outer conductors of the coaxial line, leads to a very considerable measurement deviation, which increases rapidly with the increase of the dielectric constant
The latter is due to the existence of a series of TMs in the coaxial line-filled dielectric circular waveguide combination 0p modulus, making calculations extremely complex

Method used

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  • Coaxial-dielectric circular waveguide resonant cavity with frequency range of 1GHz-8GHz and dielectric parameter testing method
  • Coaxial-dielectric circular waveguide resonant cavity with frequency range of 1GHz-8GHz and dielectric parameter testing method
  • Coaxial-dielectric circular waveguide resonant cavity with frequency range of 1GHz-8GHz and dielectric parameter testing method

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Embodiment

[0115] Embodiment: table 1, figure 2 Some cases of propagating evanescent waves in a medium, and Table 2, image 3 Some cases of guided waves propagating in a medium. Table 3 is the measurement data and calculation results of PTFE samples in the MPC-14 coaxial system at two frequencies.

[0116] Table 1.¶ i When it is a real number, some coaxial systems can be used to measure the dielectric constant (s=0.001)

[0117]

[0118] * εr max Indicates the maximum limit value that can be measured.

[0119] Table 2.γ i When it is an imaginary number, some coaxial systems can be used to measure the dielectric constant (s=0.001)

[0120]

[0121] * ε rmin Indicates the minimum limit value that can be measured.

[0122] Table 3 Measurement results of PTFE samples (Φ4.25mm×1.5mm)

[0123]

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Abstract

The invention discloses a coaxial-dielectric circular waveguide resonant cavity for measurement of a dielectric medium with frequency range of 1GHz-8GHz, and a dielectric testing method. An adjustable short-circuiter with a travel of 100mm is arranged at one end of an air coaxial measuring line formed by an outer conductor, an inner conductor and an axially moving probe, and an input coupling loop is arranged on the adjustable short-circuiter. A cylindrical dielectric sample is arranged at a gap between the inner conductor and a metal short circuit board at the other end of the coaxial measuring line, and the cylindrical dielectric sample and the coaxial line outer conductor form a dielectric circular waveguide. TEM (transverse electromagnetic) wave in the coaxial line and TM 01 wave in the sample are combined in resonance to obtain a complex dielectric constant of a material. The difficulty in preparation of the coaxial line and insertion and tight fit of ring samples is overcome, electromagnetic field distribution of the sample is unrelated to sample size and operating frequency, and error of matching of the sample radial size with a metal wall is no longer a main factor causing uncertainty of measurement. The dielectric material with the relative dielectric constant of 1-100 (or higher) can be measured.

Description

technical field [0001] The invention relates to a method for testing the dielectric of a resonant cavity, in particular to a coaxial line-dielectric circular waveguide resonant cavity and a method for testing dielectric parameters used for dielectric measurement of 1GHz to 8GHz. Background technique [0002] In the microwave frequency band, the basic electrical parameters of non-magnetic media, namely the relative permittivity ε r , Dielectric loss tangent tanδ, is to study materials and develop corresponding dielectric components, such as substrates, dielectric resonators, dielectric filters, dielectric antennas, microstrip antennas, low temperature co-fired ceramics (LTCC), microwave modules, microwave integration Base. As we all know, for the dielectric measurement at a frequency of 1 GHz to 8 GHz, the current commonly used coaxial line transmission test method is the reflection-transmission measurement of the circular sample or the reflection-transmission measurement of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26H01P7/00
Inventor 倪尔瑚倪郁青朱永花
Owner ZHEJIANG UNIV