Series-Coupled SAW Transducer Layout for Clutter Noise Reduction

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Solution Overview

Problem

Existing surface acoustic wave (SAW) devices suffer from energy leakage and decreased quality factor due to clutter interference, which affects their performance in filtering and transmitting electrical signals.

Innovation Solution

The acoustic wave device employs a series-coupled transducer set with a floating common electrode and dummy electrodes to reduce clutter interference, enhancing signal transmission quality by leveraging symmetry and series coupling of transducers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional SAW filter structure is used, then the device can filter signals, but energy leakage occurs resulting in decreased quality factor

Engineering Contradiction:

Improvequality factorVSAvoidenergy leakage

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent introduces dummy electrodes that are asymmetric in configuration relative to the signal electrodes, creating an asymmetric electrode structure. This asymmetry generates clutter signals that are intentionally designed to cancel the energy leakage paths, thereby improving the quality factor by reducing energy loss through controlled asymmetric electrode arrangement

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent converts the harmful energy leakage into a beneficial effect by introducing dummy electrodes that generate clutter signals. These clutter signals, which would normally be harmful interference, are strategically designed to cancel the energy leakage paths, transforming the harmful energy loss into a benefit that improves the quality factor

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Object-affected harmful factors

If transducers are coupled in series through a floating common electrode, then clutter interference is reduced, but device complexity increases

Engineering Contradiction:

Improveclutter interferenceVSAvoidtransducer coupling structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent merges multiple transducer elements into a series-coupled configuration where they share a common floating electrode. This merging approach allows the transducers to work together in a coordinated manner, reducing clutter interference through constructive interference patterns while sharing common structural elements to mitigate the increase in complexity

Inventive Principle:

Principle #5Merging (Combining)

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 improves the quality factor and reduces clutter interference, thereby enhancing the overall performance of the acoustic wave device in filtering and transmitting signals.

Implementation Method 1

a piezoelectric substrate has a first surface. The series-coupled transducer set includes a first transducer and a second transducer coupled in series, and disposed on the first surface of the piezoelectric substrate

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS20260066871A1Surface Acoustic Wave Device for Reducing Noise

Publication Date: 2026.03.05 RICHWAVE TECH CORP

AI summary

An acoustic wave device includes a piezoelectric substrate and a series-coupled transducer set. The piezoelectric substrate has a first surface. The series-coupled transducer set includes a first transducer and a second transducer coupled in series, and disposed on the first surface of the piezoelectric substrate. The first transducer includes a first electrode and a common electrode. The second transducer includes a second electrode and the common electrode. The common electrode is floating, and the first transducer and the second transducer are coupled in series through the common electrode.