Broadband dielectric constant measuring device

Abstract

The invention discloses a broadband dielectric constant measuring device. The broadband dielectric constant measuring device comprises a coplanar waveguide transmission line as well as two symmetricalstructures, namely a composite section I and a composite section II; the composite section I and the composite section II are connected in series and loaded on a conduction band in the middle of thecoplanar waveguide transmission line; the composite section I consists of a section with a triple structure; the section with the triple structure comprises a coplanar waveguide with one open terminaland two groove line sections with short-circuited terminals; the coplanar waveguide with one open terminal and the two groove line sections with short-circuited terminals are connected in parallel; atest area for placing a tested sample is arranged on the composite section I; and the composite section II consists of one right-angle bending type groove line gap. The test device provided by the invention is simple in structure and high in sensitivity and belongs to broadband measurement; and the composite section I and the composition section II on the measuring device are processed by the traditional etching process, so that the price is low, the processing difficulty is low, batch production is facilitated, and on-line and real-time broadband detection can be realized.

Description

technical field [0001] The invention belongs to the technical field of microwave measuring devices, and in particular relates to a broadband dielectric constant measuring device. Background technique [0002] With the application of microwave technology in the fields of biology, cytology, food chemical industry and electromagnetic compatibility, many new interdisciplinary subjects have emerged, such as microwave chemistry and electromagnetic field biomedicine. However, the application of microwave technology in the above-mentioned fields still faces many technical barriers due to insufficient research on the mechanism of interaction between microwaves and biological media or chemical substances. The electrical parameters of biological media or chemical substances are important parameters that reflect the interaction between microwaves and them. For example, in the field of biology, studies on thermal denaturation of proteins, double-layered plasma membranes, single-cell char...

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Problems solved by technology

In the transmission / reflection method, the broadband measurement method based on the coplanar waveguide transmission line has achieved considerable development. The basic idea is to place the sample to be tested on the coplanar waveguide transmission line, and measure the scattering parameter information of the two ports combined with de-embedding technology. Or other algorithms (such as neural network algorithm) to invert the dielectric properties of the measured sample, its advantage is ultra-wideband measurement, the disadvantage is limited sensitivity, sometimes faced with complex de-embedding technology

For the high test sensitivity, various methods have been proposed, the literature "Haase N M N, Fuge G, Trieu H K, et al. Miniaturized Transmission-Line Sensor for Broadband Dielectric Characterization of Biological Liquids and Cell Suspensions [J]. IEEE Transactions on Microwave Theory & Techniques, 2015, 63(10):3026-3033.” reported that the dielectric properties of broadband liquid biological media were detected by loading microfluidic channels. The processing of microfluidic channels requires special processes, which increases the difficulty and cost of processing , not suitable for widespread use

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