Small-size sample dielectric characteristic detection device based on micro-flow channel electric field enhancement

Abstract

The invention discloses a small-size sample dielectric property detection device based on micro-flow channel electric field enhancement. The small-size sample dielectric property detection device includes a vector network analyzer and a sensor, wherein the sensor is composed of a metal layer and a dielectric substrate which are arranged vertically, a coplanar waveguide transmission line is etchedon the metal layer, and the coplanar waveguide transmission line comprises two signal transmission gaps, a middle conduction band and a metal ground, and a test area composed of a rectangular capacitor and slot line branch nodes is loaded on the middle conduction band in series, the slot line branch nodes are vertically connected to the two sides of the rectangular capacitor, and the groove line branch node is vertically connected with the two signal transmission gaps. The testing device is simple in structure and high in sensitivity, the measuring area on the sensor, namely the rectangular capacitor and the groove line branch nodes at the two ends, is processed by adopting a traditional etching process, the cost is low, the processing difficulty is low, batch production is facilitated, and on-line real-time detection can be realized.

Description

technical field [0001] The invention belongs to the technical field of microwave measurement devices, and in particular relates to a small-sized sample dielectric characteristic detection device based on micro-flow channel electric field enhancement. 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 denaturati...

AI Technical Summary

Problems solved by technology

Generally speaking, the measurement methods of electrical characteristics of microfluidics can be divided into resonance method and non-resonance method. The resonance method is characterized by high sensitivity and accuracy, but it belongs to narrow-band and non-contact testing.

The non-resonance method is characterized by simple equipment and low test sensitivity, but it belongs to broadband test, which can realize contact and non-contact measurement

[0003] Many electrical measurement methods for small-sized samples use coplanar waveguide transmission lines, and load microfluidic channels in the middle conduction band, but do not consider enhancing the electric field of the microfluidic channels, nor consider impedance matching, resulting in the most electromagnetic interference in the entire detection device. The strong part is concentrated in the two signal transmission gaps of the coplanar waveguide transmission line, and the microfluidic channel needs to be processed by a special process, which greatly increases the processing cost and difficulty of the sensor, and is difficult to be used in mass production and in large quantities. It is widely used within the range and can only be used to detect liquid samples

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