Acoustic Wave Filter Conductive Structure for Low Insertion Loss
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Solution Overview
Problem
Existing acoustic wave filters face challenges in minimizing resistive losses in electrical connections between resonators due to small gaps, which contribute to insertion losses, especially when miniaturization is critical.
Innovation Solution
Implementing a conductive structure with a first portion electrically connected to a bus bar and a second portion spaced from the fingers by an air gap, allowing for reduced resistive losses and improved performance by maintaining a clean frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the gap between resonators is reduced to minimize device size, then the device achieves miniaturization, but resistive losses in electrical connections increase causing higher insertion losses
Solution Approach 1:
The patent introduces a conductive structure as an intermediary element that electrically connects adjacent resonators. This conductive structure acts as a mediator that bridges the gap between resonators, allowing electrical signals to pass through while maintaining physical separation. The conductive structure includes a first portion that makes electrical contact with the resonator and a second portion that extends toward adjacent resonators, enabling low-resistance electrical connections without requiring the resonators to be in direct physical contact, thus reducing resistive losses while maintaining miniaturization.
2Volume of moving object
If the gap between resonators is reduced to minimize device size, then the device achieves miniaturization, but the frequency response becomes degraded
Solution Approach 1:
The conductive structure serves as an intermediary that preserves the frequency response by providing a controlled electrical connection path. The first portion of the conductive structure is positioned to make electrical contact with the resonator, while the second portion extends toward adjacent resonators with a controlled gap. This intermediary structure maintains the electrical integrity and frequency characteristics of the resonators while enabling close spacing for miniaturization.
3Loss of energy
If a conductive structure is added to reduce resistive losses, then insertion losses are minimized, but the device complexity increases
Solution Approach 1:
The patent merges the conductive structure with existing device components. The conductive structure is integrated into the resonator assembly, where its first portion combines with the resonator's electrical terminals and its second portion extends to connect with adjacent resonators. This merging approach allows the conductive structure to perform multiple functions (electrical connection, signal transmission) without requiring completely separate additional components, thereby reducing the overall device complexity despite the added functionality.
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 conductive structure with an air gap design reduces resistive losses and enhances the performance of acoustic wave systems by minimizing insertion losses and maintaining a stable frequency response.
Implementation Method 1
a conductive structure including a first portion extending between the first resonator and the second resonator, and a second portion at least partially positioned over the first finger, the second portion spaced from the first finger
Implementation Method 2
A surface acoustic wave resonator can include an interdigital transductor electrode on a piezoelectric substrate. The surface acoustic wave resonator can generate a surface acoustic wave on a surface of the piezoelectric layer
Data Source
AI summary
An acoustic wave device is disclosed. The acoustic wave device can include a piezoelectric layer, an interdigital transducer electrode over the piezoelectric layer, and a conductive structure. The interdigital transducer electrode includes a first bus bar, a first set of fingers extending from the first bus bar, a second bus bar, and a second set of fingers extending from the second bus bar. The conductive structure can include a first portion positioned on the first bus bar and a second portion at least partially positioned over the first set of finger fingers. The second portion is spaced from the first set of fingers by a gap.