Device and method for measuring ferroelectricity of ferroelectric material under microwave frequency band

Abstract

The invention discloses a device and a method for measuring the ferroelectricity of a ferroelectric material under a microwave frequency band. A test circuit board comprises three microstrip two-port networks, comprising a forward network, a delay network and a measuring network, and coaxial connectors, microstrip lines, high-resistance quarter-wave short circuit branches, high voltage resistant band-pass filters and DC feed circuits are arranged from both ends to the middle of each network. A high-voltage power supply is connected to the DC feed circuits of the three microstrip two-port networks respectively and provides DC bias for a sample to be tested. A computer reads the S parameters of the three microstrip two-port networks from a vector network analyzer and calculates the dielectric constant of the ferroelectric material according to the read S parameters. The invention can measure the dielectric constant of the sample to be tested under the microwave frequency band, reduce the difference loss of the filters, increase the measuring accuracy and ensure the safety of the vector network analyzer during high voltage measurement.

Description

Technical field [0001] The invention belongs to the field of microwave measurement, and relates to a measuring method and a measuring device for ferroelectric properties of ferroelectric materials. Background technique [0002] Ferroelectric material is a widely used functional material. Ferroelectricity is one of the important characteristics of ferroelectric materials. Ferroelectricity refers to the characteristic that the spontaneous polarization of certain insulator materials can be reversed under the action of an applied electric field. In general, it is the characteristic that the dielectric constant changes with the applied voltage. In order to explore, research and develop ferroelectric materials and their devices, scientists and engineers have put forward requirements for the measurement of ferroelectric properties of ferroelectric materials. [0003] Checking Chinese and foreign patents and scientific literature, there are many methods for measuring ferroelectric proper...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiency that the existing technology cannot measure the ferroelectricity of ferroelectric materials in the microwave frequency band, the present invention provides a measuring device for the ferroelectricity of ferroelectric materials in the microwave frequency band, which can measure the dielectric constant of ferroelectric materials in the microwave frequency band The characteristic that changes with the applied voltage, the applied voltage can reach 3kV

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