Adjustable and controllable capacitor with layered composite structure, and method of adjusting and controlling dielectric through piezoelectric stress

Abstract

The invention discloses an adjustable and controllable capacitor with a layered composite structure, and a method of adjusting and controlling the capacitance of dielectric bodies in a composite structure by applying an electrostatic field and using piezoelectric stress generated through a piezoelectric effect. The adjustable and controllable capacitor comprises ferroelectric piezoelectric patches and ferroelectric dielectric bodies. The ferroelectric piezoelectric patches and the ferroelectric dielectric bodies form multiple layered composite structures by closely bonding or cofiring together. The dielectric bodies are sheet-shaped dielectric bodies to be adjusted and controlled. Under the effect of the electrostatic field, piezoelectric stress or strain generated by the piezoelectric patches is transmitted to the sheet-shaped dielectric bodies to be adjusted and controlled, and the electric interface state of the ferroelectric dielectric bodies is changed under the effect of the outer stress, so the dielectric capacitance can be adjusted and controlled. The capacitor helps to effectively overcome the defects that a conventional adjustable and controllable capacitor is complicated in structure, narrow in adjustable frequency range or the like, has the advantages of being simple in manufacture process, convenient to use and the like, and can be widely applied to the field of adjustable and controllable intelligent electronic devices and equipment.

Description

technical field [0001] The invention belongs to the technical field of electronic devices, and relates to the technology of an intelligent adjustable capacitor, in particular to an adjustable capacitance with a layered composite structure and a method for regulating dielectric by piezoelectric stress. Background technique [0002] Capacitors are basic electronic devices and have a wide range of applications in common electronic devices, such as energy storage, power factor correction, filtering and filtering, signal coupling, coordination circuits, sensors, and pulsed power devices. Currently, the rapid development of tunable microwave devices and smart electronic devices has expanded the demand for tunable inductors. Existing research is dedicated to the development of adjustable capacitors with large adjustable quantity, simple structure and large frequency range. Over the past decade, prior art has shown that the permittivity of dielectric materials responds to external ...

AI Technical Summary

Problems solved by technology

However, based on this design principle, the capacitance of the dielectric changes only in a narrow frequency range near the resonant frequency of the magnetic material, not a wide-band and uniform change.

In the prior art, there is also direct application of a DC bias electric field on the dielectric material to change the dielectric constant, but the range of change is small, and it is inconvenient to use on the circuit

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