Micro-quantity liquid dielectric constant test sensor

A technology of permittivity and trace liquid, applied in the measurement of dielectric properties, measurement of electrical variables, measurement of resistance/reactance/impedance, etc., can solve complex de-embedding and other problems, and achieve the effect of high sensitivity

Inactive Publication Date: 2016-06-01
HENAN NORMAL UNIV
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Problems solved by technology

But unfortunately, at the microwave frequency, the background signal of the transmission line itself cannot be avoided, and there are great limitations in the capture of the weak signal caused by the trace sample. face a complex de-embedding process when constant

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  • Micro-quantity liquid dielectric constant test sensor
  • Micro-quantity liquid dielectric constant test sensor
  • Micro-quantity liquid dielectric constant test sensor

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Embodiment Construction

[0010] Describe embodiment in detail in conjunction with accompanying drawing,

[0011] The measurement device of the present invention comprises two identical Wilkinson power dividers, a measurement branch and a reference branch, and there is a 180-degree phase difference between the two paths, which is determined by a 180-degree phase shifter 5 in a broadband single-spiral shape. produced as image 3 shown. The structure diagram of the present invention is as figure 1 As shown, the Wilkinson power divider is composed of coplanar waveguide 1 and coupled coplanar waveguide 2, and the measurement branch 3 is as follows image 3 In the shown coplanar waveguide phase shifter, the reference branch 4 is a coplanar waveguide transmission line. In this example, a container containing the measured object is pasted on the measurement area and the reference area, and the center of the container is located at the center of the coplanar waveguide transmission line of the phase shifter....

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Abstract

The present invention discloses a micro-quantity liquid dielectric constant test sensor. The key points of the technical scheme are that the micro-quantity liquid dielectric constant test sensor is a two-port device and comprises two identical 3dB Wilkinson power dividers and two branches with the phase difference of 180 degrees, one branch is a measurement branch, the other branch is a measurement branch, a tested objected and a reference object are respectively placed on the two branches, and the two ports of the sensor are connected to a vector network analyzer. The micro-quantity liquid dielectric constant test sensor has an obvious advantage in the aspect of testing a micro-quantity liquid dielectric constant, the sensitivity is high, and the weak signal caused by a micro-quantity tested object can be captured.

Description

Technical field: [0001] The invention relates to the test of the dielectric constant of a trace liquid, in particular to a test sensor for the dielectric constant of a trace liquid. Background technique: [0002] Since N.H.Williams reported the relevant research results that microwaves can speed up certain chemical reactions in 1967, the application of microwave energy has shown great vitality. Now, microwave technology has been widely used in the fields of biomedicine, food chemical industry, cell molecular science and medical chemical industry, and has achieved huge economic benefits. Therefore, studying the interaction between the microwave and the sample and obtaining the high-frequency electrical parameters of the sample is a very critical research content, which has been highly valued and extensively studied by domestic and foreign scientific and technological workers. [0003] For very precious samples in fields such as protein thermal denaturation, bilayer lipid mem...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
CPCG01R27/2617
Inventor 刘伟娜詹华伟陈洋洋邢孟女
Owner HENAN NORMAL UNIV
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