Adjustable annular inductor

Abstract

The invention provides an adjustable annular inductor. The adjustable annular inductor comprises an annular magnetic electricity composite element and a coil which is wound around the annular magnetic electricity composite element; an annular piezoelectric element and an annular ferromagnetic element are arranged concentrically to form the composite structure of the annular magnetic electricity composite element. When an external electrostatic field is exerted, the annular piezoelectric element retracts or expands in the radial direction because of the piezoelectric effect, produced mechanical stress is transmitted to the annular ferromagnetic element in the radial direction along the annular piezoelectric element, the magnetic conductivity and corresponding inductance value of the annular ferromagnetic element change because of the piezoelectric effect, and therefore inductance is adjusted through the electrostatic field. In addition, as the annular piezoelectric element and the annular ferromagnetic element are adopted for forming the concentric composite structure, the front surface contact area and corresponding normal stress of the piezoelectric element and the ferromagnetic element are increased, larger mechanical stress is transmitted to the ferromagnetic element through the piezoelectric element, and therefore the adjustable range of the adjustable annular inductor is increased.

Description

technical field [0001] Embodiments of the present invention relate to electronic component technology, and in particular to an adjustable loop inductor. Background technique [0002] Inductance is a basic electronic device, which is widely used in common electronic devices. At present, with the rapid development of wireless communication technology, there is a large demand for adjustable inductance. Therefore, a lot of research is devoted to the development of tunable inductors with large tunability, high quality factor and low energy loss. [0003] Magnetoelectric adjustable inductance is a new type of adjustable inductance. Magnetoelectric adjustable inductance uses the piezoelectric effect and piezoelectric effect coupled by stress (or strain, displacement) to realize the control of the magnetic permeability by the electric field. The piezoelectric effect is divided into positive piezoelectric effect and inverse piezoelectric effect. The inverse piezoelectric effect main...

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Problems solved by technology

[0004] The embodiment of the present invention provides an adjustable loop inductor to overcome the problem of small adjustable amount of magnetoelectric adjustable inductor in the prior art

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