Acoustic Wave Filter Layout With Ground Shielding for Isolation
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Solution Overview
Problem
Existing acoustic wave devices face signal leakage issues due to cross-talk between conductors, leading to deterioration in isolation characteristics.
Innovation Solution
The acoustic wave device incorporates a laminated structure with a ground electrode electrically insulated from relay electrodes, positioned between functional and wiring conductors, to reduce signal leakage between acoustic wave elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If acoustic wave elements are laminated to increase device functionality, then device versatility is improved, but signal leakage between elements increases causing isolation characteristics to deteriorate
Solution Approach 1:
A ground electrode is introduced as an intermediary element between the first and second acoustic wave elements. This ground electrode acts as a shield that blocks electromagnetic signals from leaking between the laminated elements, thereby maintaining isolation characteristics while allowing the elements to remain laminated for compact design and enhanced functionality.
Solution Approach 2:
The solution moves from a two-dimensional planar arrangement to a three-dimensional laminated structure with an additional grounding layer. By adding the ground electrode in the vertical dimension between the functional elements, the patent achieves both compact laminated integration and effective signal isolation without compromising either versatility or reliability.
2Area of stationary object
If conductors are placed closer together to reduce device size, then device compactness is improved, but cross-talk between conductors increases causing signal leakage
Solution Approach 1:
The ground electrode serves as a mediating shield between conductors in close proximity. Even when conductors are placed close together to achieve compact device size, the ground electrode intercepts and redirects electromagnetic fields, preventing cross-talk and signal leakage between adjacent conductors.
Solution Approach 2:
The harmful electromagnetic fields that would cause cross-talk are extracted and redirected to the ground electrode. By providing a dedicated path to ground, the harmful electromagnetic energy is removed from the signal paths and dissipated safely, preventing interference between closely spaced conductors.
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
This configuration effectively reduces signal leakage, thereby preventing deterioration in isolation characteristics and enhancing the performance of acoustic wave filters by increasing Q values and minimizing insertion loss.
Implementation Method 1
a ground electrode provided on the first substrate, between at least one of the first functional electrode and the first wiring conductor, and the relay electrode, and electrically insulated from the relay electrode
Implementation Method 2
a first substrate having piezoelectricity at least in a portion thereof
Data Source
AI summary
An acoustic wave device includes a first acoustic wave element including a first substrate having piezoelectricity at least in a portion thereof, a first functional electrode provided on a first surface of the first substrate, and a first wiring conductor electrically connected to the first functional electrode. The first acoustic wave element further includes a relay electrode on the first surface of the first substrate and electrically connected to a second wiring conductor, and a ground electrode on the first surface of the first substrate and electrically connected to the first functional electrode. The ground electrode is between at least one of the first functional electrode and the first wiring conductor, and the relay electrode, and is electrically insulated from the relay electrode.