Acoustic Wave Resonator Layout for Simpler Filter Wiring
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Solution Overview
Problem
Existing acoustic wave devices face complexity in electrical connections due to the need for wiring between multiple devices, which complicates the formation of circuits such as filters.
Innovation Solution
The acoustic wave device incorporates a piezoelectric body with a groove on one main surface and a lead-out electrode on the other, allowing for electrical connection between multiple resonators without the need for extensive wiring by using electrodes on the second main surface to bypass the groove, facilitating easier connection to external components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the piezoelectric body is cut together with the acoustic layer laminate along outer peripheries of the first electrode and the second electrode, then the device structure is simplified, but wiring becomes complicated when multiple devices are electrically connected
Solution Approach 1:
The patent introduces a lead-out electrode that extends from the first electrode through the thickness direction of the piezoelectric body to the second main surface. This three-dimensional electrode configuration allows electrical connection to be established in the thickness direction rather than only in the plane, enabling simpler wiring when multiple devices are connected to form circuits such as filters
2Reliability
If wiring using wire electrodes is used for electrical connection, then electrical connection between devices is achieved, but wiring becomes complicated when multiple acoustic wave devices are connected to form circuits
Solution Approach 1:
The patent merges the function of internal electrodes with the lead-out electrode that extends to the second main surface. This integration allows the lead-out electrode to serve dual purposes: maintaining electrical connection within the device and providing external connection points, thereby simplifying the wiring required when multiple devices are connected to form circuits
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 design simplifies the electrical connection of acoustic wave devices, enhances impedance ratio, and improves filter characteristics by reducing loss in the pass band, making it easier to integrate multiple devices into circuits.
Implementation Method 1
a piezoelectric body (4) laminated on the acoustic layer laminate (3)
Implementation Method 2
The acoustic layer includes an acoustic layer laminate in which a high-impedance acoustic film having a relatively high acoustic impedance and a low-impedance acoustic film having a relatively low acoustic impedance are laminated. By laminating the piezoelectric body on the acoustic layer laminate, the bulk wave can be confined in the piezoelectric body.
Data Source
AI summary
An acoustic wave device includes a support substrate, a piezoelectric body, an acoustic layer laminate, first and second electrodes, and a lead-out electrode. The first electrode is on a first main surface of the piezoelectric body, the second electrode is on a second main surface of the piezoelectric body, the lead-out electrode is on the first main surface or the second main surface of the piezoelectric body, the lead-out electrode is electrically connected to the first electrode or the second electrode, side surface grooves extend from the first main surface side of the piezoelectric body, and the side surface grooves are provided in at least a portion of a remaining portion excluding a portion provided with the lead-out electrode from a region in an outer side portion of at least one of the first electrode and the second electrode.