SAW Resonator Electrode Layout to Suppress Clutter Waves Reliably
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Solution Overview
Problem
Surface acoustic wave (SAW) resonator devices face reliability issues due to the adverse effects of metal structures used for clutter wave suppression, which can lead to capacitive breakdown and energy loss.
Innovation Solution
A surface acoustic wave resonator device is designed with a piezoelectric substrate, interdigital transducers, and conductive structures that form a clutter suppression structure, where the conductive structures are electrically connected to the interdigital electrodes, creating equivalent electrical potentials to prevent capacitive breakdown and enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal structure is disposed over the interdigital electrodes to suppress clutter wave, then clutter wave suppression is improved, but device reliability deteriorates due to capacitive breakdown
Solution Approach 1:
A dielectric layer is introduced as an intermediary between the metal structure and the interdigital electrodes. This dielectric layer acts as a mediator that prevents direct capacitive coupling and breakdown while still allowing the metal structure to suppress clutter waves effectively. The dielectric material isolates the harmful electrical interaction while preserving the acoustic wave suppression function.
Solution Approach 2:
The dielectric layer is placed in advance between the metal structure and electrodes to prevent capacitive breakdown before it occurs. This protective layer cushions against electrical breakdown by providing electrical isolation, thereby preserving device reliability while maintaining the clutter suppression functionality of the metal structure.
2Object-affected harmful factors
If a metal structure is disposed over the interdigital electrodes to suppress clutter wave, then clutter wave suppression is improved, but energy loss increases
Solution Approach 1:
The dielectric layer serves as an intermediary that reduces energy loss by preventing direct parasitic capacitive coupling between the metal structure and interdigital electrodes. This isolation minimizes energy dissipation while maintaining the clutter wave suppression effect.
Solution Approach 2:
By changing the electrical parameters through the introduction of a dielectric layer with specific permittivity characteristics, the energy loss is reduced. The dielectric material modifies the electrical field distribution and reduces parasitic capacitance, thereby decreasing energy loss while preserving clutter suppression performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses clutter waves while maintaining device reliability by avoiding capacitive breakdown, thus improving the performance and stability of SAW resonator devices.
Implementation Method 1
a piezoelectric substrate; an interdigital transducer, disposed on a side of the piezoelectric substrate
Data Source
AI summary
A surface acoustic wave resonator device, its manufacturing method, and a filter are disclosed. The device includes a piezoelectric substrate, and an interdigital transducer on a side of the substrate, having an interdigital electrode region, and including a first interdigital electrode and a first interdigital electrode lead-out part connected to each other, and a second interdigital electrode and a second interdigital electrode lead-out part connected to each other. The first and second interdigital electrodes are located in the interdigital electrode region, extending along a first direction and alternately arranged in a second direction. The first and second interdigital electrode lead-out parts are located on opposite sides of the interdigital electrode region. A first conductive structure and a second conductive structure overlap with end portions of the interdigital electrodes and are electrically connected to the corresponding interdigital electrodes, respectively.