Elastic wave device with resonant frequency adjustment

The elastic wave element with a variable impedance device and frequency adjustment mechanism addresses frequency stability and phase matching issues in telecommunications components, ensuring reliable operation across temperature variations and aging effects.

TW202632888APending Publication Date: 2026-08-01SOITEC SA
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Patent Information

Application Number
TW114143740
Authority / Receiving Office
TW · TW
Patent Type
Applications
Current Assignee / Owner
Priority Date
2025-11-07
Filing Date
2025-11-10
Publication Date
2026-08-01

AI Technical Summary

Technical Problem

Existing telecommunications components utilizing surface elastic waves face challenges in achieving stable frequency sources with minimal signal jitter, particularly in oscillators used in devices like digital televisions, modems, and computers, as they require filters with multiple RF bands and need to maintain phase matching and adjust frequencies to counter temperature and aging effects.

Method used

An elastic wave element with a variable impedance device, frequency adjustment, and control mechanism, comprising transducers and an electrode array, allows for precise frequency tuning and phase matching, using a frequency adjustment device to modulate the resonant frequency and adjust impedance, ensuring stability and flexibility across varying temperatures.

Benefits of technology

The solution provides instantaneous frequency adjustment, reducing temperature and aging effects, enhancing stability and reliability of oscillators, and improving phase noise performance by minimizing bandwidth transition regions and correcting frequency drift without delay.

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Abstract

An elastic wave device comprising: a variable impedance means; a first electromechanical device, in particular, a first transducer, and a second electromechanical device, in particular, a second transducer or an electrode array configured to reflect at least partially elastic waves emitted by the first electromechanical device, an array of at least one electrode located between the first electromechanical device and the second electromechanical device in the direction of propagation of the elastic waves, wherein at least one electrode of the array of at least one electrode is connected to an electrical potential via the variable impedance means; the array forming a cavity; a frequency-adjustment means configured to adjust the resonant frequency of the cavity; control means configured to control the variable impedance means.
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