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4-port apparatus for measuring dielectric constant

A measuring device and a technology for dielectric constant, applied in the field of broadband dielectric constant four-port measuring device, can solve problems such as insufficient sensitivity, and achieve the effects of simple testing device, wide frequency band, and high testing sensitivity

Inactive Publication Date: 2016-09-07
HENAN NORMAL UNIV
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Problems solved by technology

The transmission / reflection method is the most widely used. The paper "Theoretical Research and Practice of Simultaneous Measurement of Complex Electromagnetic Parameters by Open Coaxial Probe" systematically discusses the measurement technology of the complex electromagnetic properties of materials by the transmission / reflection method (coaxial probe), and has achieved good results. effect, but it faces the problem of insufficient sensitivity and multi-value extraction of dielectric constant in the later stage

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  • 4-port apparatus for measuring dielectric constant
  • 4-port apparatus for measuring dielectric constant
  • 4-port apparatus for measuring dielectric constant

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Embodiment Construction

[0013] The testing device of the present invention is as figure 1 As shown, it includes four ports, Port1, port2, port3 and port4 are input port, coupling port, output port and isolation port respectively. The whole device is composed of two identical directional couplers, and the input and coupling ports of the directional coupler adopt coplanar waveguide transmission line 1; ( is the central wavelength of the test device) part adopts coupling coplanar waveguide transmission line 2 and fan-shaped radiation surface 3; the output and isolation port adopts slot line 4; the object to be tested can be placed in the slot shown in 4 where the electric field is the strongest line; for the convenience of processing and testing, figure 1 The impedance of the coplanar waveguide 1 is 50 , the impedance of slot line 4 is selected as 100 , then the impedance of the coupled coplanar waveguide 2 is 50 ; Air bridges 5 were welded at each discontinuous place of the test device.

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Abstract

The invention discloses a 4-port apparatus for measuring a dielectric constant. The apparatus is composed of two identical bandwidth 3dB directional couplers and includes 4 ports, namely an input port, a coupling port, an output port and an isolation port. The input port and the coupling port adopt a coplanar waveguide transmission line, and the isolation port and the output port adopt a slot line. Each input / coupling port and isolation / output port adopt a coupling coplanar waveguide in transition therebetween. The output and isolation ports of the two directional couplers are connected through U-shaped slot lines. The U-shaped slot line which connects the two output ports is referred as the transmission line and is the place which has the strongest electric field in the entire apparatus. A to-be-tested object is positioned in the transmission line. In order to increase testing sensitivity, an air bridge is welded at discontinuous places of the apparatus. According to the invention, the apparatus can realize bandwidth and online measuring and has wide applicability.

Description

Technical field: [0001] The invention relates to a dielectric constant measuring device, in particular to a wide-band dielectric constant four-port measuring device. Background technique: [0002] With the vigorous development of radio frequency technology and wireless communication technology, the application of microwave energy has been pushed to a wider world. The dielectric constant measurement is to obtain the dielectric constant of the dielectric material in a wide frequency domain, which is an important branch of microwave energy application. Therefore, the measurement of the dielectric properties of materials plays an important role in the fields of industry, electromagnetic compatibility, biomedicine, and material engineering. Usually, the dielectric constant of a material cannot be directly measured, and can only be obtained by measuring other parameters related to it (such as scattering parameters), and the relationship between the dielectric constant of the medi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
CPCG01R27/2688
Inventor 刘伟娜刘海瑞王萌施艳艳
Owner HENAN NORMAL UNIV
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