Floating Wiring Layout for Heat-Dissipating Elastic Wave Filters
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Solution Overview
Problem
Existing elastic wave apparatuses face challenges in miniaturization and effective heat dissipation due to the lack of heat-dissipation electrodes connected to the interstage portion between cascaded resonators, leading to inadequate heat dissipation and increased size.
Innovation Solution
The elastic wave apparatus includes a base substrate with input/output and ground wiring lines, a floating wiring line insulated from these, and an elastic wave filter with a second electrode connected to the floating wiring line, which is in contact with the connection wiring line cascading resonators, allowing for efficient heat dissipation to the base substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat-dissipation electrodes are disposed at electrically unrelated positions in resonators, then the apparatus can be electrically functional, but the apparatus size cannot be miniaturized
Solution Approach 1:
The patent combines heat-dissipation electrodes with the interstage connection wiring lines between cascaded resonators. The heat-dissipation electrodes are electrically connected to the connection wiring lines that electrically connect adjacent resonators, merging the heat dissipation function with the existing electrical connection structure. This eliminates the need for separate heat-dissipation paths while maintaining electrical functionality and reducing apparatus size.
2Device complexity
If heat-dissipation electrodes are not connected to the interstage portion between cascaded resonators, then the electrical circuit can be simplified, but heat dissipation becomes inadequate
Solution Approach 1:
The connection wiring lines between cascaded resonators serve dual functions: electrical connection between resonators and heat dissipation from the interstage portion. The heat-dissipation electrodes connected to these wiring lines enable the same structural elements to perform both electrical and thermal functions, simplifying the overall device structure while improving heat dissipation efficiency at the interstage portion.
3Device complexity
If the number of heat-dissipation paths is small, then the device structure can be simpler, but heat dissipation is not properly performed
Solution Approach 1:
The patent divides the heat dissipation function into multiple segments by connecting heat-dissipation electrodes to multiple different connection wiring lines between cascaded resonators. This creates multiple heat dissipation paths distributed across different interstage portions, with each path handling heat from specific resonator connections. The segmented approach improves overall heat dissipation performance while maintaining relatively simple device structure.
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 enhances heat dissipation, enables miniaturization of the apparatus, and provides design flexibility by allowing the elastic wave filter to be securely mounted on the base substrate, improving power durability and reducing the size of the apparatus.
Implementation Method 1
heat generated at an interstage portion between cascaded resonators can be sufficiently dissipated to the base substrate via the second electrode
Data Source
AI summary
A small-sized elastic wave apparatus in which heat generated at a portion of a cascade connection between resonators is sufficiently dissipated includes on one main surface of a piezoelectric substrate in an elastic wave filter mounted on a base substrate on which an input/output wiring line, a ground wiring line, and a floating wiring line insulated from the input/output wiring line and the ground wiring line are provided, first electrodes coupled to the input/output wiring line or the ground wiring line, second electrodes coupled to the floating wiring line, resonators, connection wiring lines connecting the resonators, and electrode wiring lines connecting the resonators and the first electrodes. The second electrodes are disposed in contact with the connection wiring lines cascading the resonators.