Double-frequency broadband microwave sensor

Abstract

The invention discloses a double-frequency broadband microwave sensor. The double-frequency broadband microwave sensor comprises a coplanar waveguide transmission line, and two combined nodules whichare of the same structure and loaded on an intermediate conduction band of the coplanar waveguide transmission line in series; each combined nodule is composed of a terminal-open-circuited coplanar waveguide and two terminal-short-circuited slot line nodules which are connected with the terminal-open-circuited coplanar waveguide in parallel; the two ends of the combined nodules are connected withtwo signal transmission gaps of the coplanar waveguide transmission line in series through first slot line gaps and second slot line gaps in sequence, and the two combined nodules which are of the same structure are provided with test zones for placing to-be-tested samples. The test device is simple in structure and high in sensitivity; the slot line gaps and the combined nodules on the sensor areprocessed with a traditional etching process, the price is low, the processing difficulty is low, batch production is facilitated, and online real-time double-frequency broadband detection can be achieved.

Description

technical field [0001] The invention belongs to the technical field of dielectric constant measuring devices, in particular to a dual-frequency broadband microwave sensor. 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, due to insufficient research on the interaction mechanism between microwaves and biological media or chemical substances, the application of microwave technology in the above fields still faces many technical barriers. 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 such as thermal denaturation of proteins, double-layered plasma membranes, single-cell characteristics, a...

AI Technical Summary

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

In order to improve the 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 property detection of broadband liquid biological media was realized by loading microfluidic channels. The processing of microfluidic channels requires special processes, which increases the difficulty and cost of processing. Not suitable for widespread promotion

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