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Electromechanical device with adjustable resonant frequency

An electromechanical device and frequency technology, applied in circuits, electrical components, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve problems such as limited scope

Pending Publication Date: 2022-04-22
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, for the device described in this article, the range in which the resonant frequency can be adjusted is still limited (the width of the range is about 0.1% of the resonant frequency)

Method used

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  • Electromechanical device with adjustable resonant frequency
  • Electromechanical device with adjustable resonant frequency
  • Electromechanical device with adjustable resonant frequency

Examples

Experimental program
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Effect test

Embodiment Construction

[0093] figure 1 Schematically shows an electromechanical device 1 comprising an elastic wave resonator 2 comprising a single interface transducer T I and a single resonant frequency tuned transducer T T . This case is presented for comparison purposes to better illustrate the interest of equipping such a resonator with several interface transducers and several tuning transducers along the The propagation paths C cross each other.

[0094] The device 1 consists of lithium niobate LiNbO 3 The fabricated solid piezoelectric substrate, as cross-section X, serves as a propagating support for surface acoustic waves propagating on the surface of the substrate. The resonator 2 can be made by depositing a metal layer (here an aluminum layer) on the free surface of the substrate and then by performing photolithography and etching of this layer in such a way as to delimit the two reflections Devices R1 and R2, transducer T T and T I The electrodes and the contact areas make it po...

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PUM

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Abstract

An electromechanical device (8) comprising a piezoelectric support delimited by a surface or two surfaces parallel to each other, and a resonator (80) on the support for elastic waves propagating parallel to said one or more surfaces, the resonator comprising:-two reflectors (R1, R2) delimiting the resonator and reflecting said waves,-several interface transducers (TI), the invention relates to a device for generating a wave from an electrical signal, comprising:-a plurality of resonant frequencies for generating said wave from an electrical signal, and-a number of transducers (TT) for controlling said resonant frequencies, each transducer comprising a first electrode (10, 30) and a second electrode (20, 40) intersecting each other, the transducers being arranged along a propagation path (C) followed by said wave in a resonator, along said path, alternating between an interface transducer (TI) and a tuning transducer (TT).

Description

technical field [0001] The technical field is the field of electromechanical devices that exploit the propagation of elastic waves for the realization of electrical resonator functions suitable for more complex functions such as filters, frequency references or other functions. The resonant frequencies of these devices are usually in the range of a few hundred kHz to several GHz. Background technique [0002] In this field, devices based on surface elastic wave ("SAW", for surface acoustic wave) resonators are known. Such devices typically include a relatively thick, solid piezoelectric substrate. The elastic waves in question of the Rayleigh, surface transverse wave ("STW") or skimmed body wave ("SSBW") modes propagate on the substrate surface parallel to the surface. [0003] Two reflectors are then fabricated on the surface of the substrate, which are reflective for these surface waves and are positioned facing each other so as to form a surface acoustic wave resonator....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/25H03H9/145H10N30/30H10N30/87
CPCH03H9/25H03H9/14514H03H2009/02165H03H9/02228H03H9/6403H03H9/6426H03H9/6436H10N30/30H10N30/87
Inventor 亚历山大·莱因哈特布鲁诺·雷格阿克塞尔·索瓦吉
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES