A four-port measuring device for dielectric constant

A measuring device and a technology for dielectric constant, which are applied in the field of broadband dielectric constant four-port measuring devices, can solve problems such as insufficient sensitivity, and achieve the effects of simple testing device, wide frequency band, and high testing sensitivity
CN105929247BInactive Publication Date: 2020-05-12HENAN NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
HENAN NORMAL UNIV
Publication Date
2020-05-12
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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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