Liquid dielectric constant sensor based on miniaturized dielectric resonator antenna and application

Abstract

The invention belongs to the technical field of liquid characteristic detection, and discloses a liquid dielectric constant sensor based on a miniaturized dielectric resonator antenna and an application, wherein a micro cavity is introduced at the top of the dielectric resonator, and a shorting pin is introduced in the middle of the dielectric resonator; the feed structure is a feed probe on one side of the resonator; the feed probe is located on one side of the dielectric resonator and is in close contact with the side of the dielectric resonator; the shorting pin introduced in the middle ofthe dielectric resonator is connected to the floor; and the dielectric resonator and feed structure are on the same side of the floor. The liquid dielectric constant sensor provided by the invention has the characteristics of small volume, simple structure and high sensitivity, and has broad application prospects in the field of liquid sensors. By introducing the shorting pin in the middle of thecylindrical dielectric resonator antenna, the fundamental mode thereof is changed from HEM11delta mode into TM10delta mode. Moreover, the TM10delta mode is also greatly reduced compared to conventional cylindrical dielectric resonator antennas.

Description

technical field [0001] The invention belongs to the technical field of liquid characteristic detection, in particular to a liquid dielectric constant sensor based on a miniaturized dielectric resonator antenna and its application. Background technique [0002] At present, the closest existing technology: microwave sensors have a wide range of applications in daily life and industrial production applications. Due to the high working frequency band (often GHz frequency band), microwave sensors have the advantages of small size, high sensitivity, strong reliability, no pollution and low cost, and are widely used in temperature detection, building form detection, biomedicine and chemical industry field. Common microwave sensor applications include temperature sensors, tension and object deformation sensors, and material dielectric property sensors, among others. Liquid dielectric property sensors have broad prospects in food inspection, medical testing and chemical composition...

AI Technical Summary

Problems solved by technology

However, this method often requires a certain volume of liquid to complete the detection, resulting in waste of liquid and environmental pollution.

[0007] To sum up, the problems existing in the prior art are: most of the liquid permittivity sensors based on the resonator antenna design are relatively large in size, and the amount of liquid to be tested is also required to be large, which is likely to cause waste of liquid and environmental pollution

Due to its advantages of low cost and high efficiency, dielectric resonator antennas have attracted widespread attention. Cylindrical dielectric resonator antennas working in HEM mode have been introduced into the design of liquid sensors. However, due to their working modes, they cannot Realize the miniaturization design of the antenna, making the sensor volume larger

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