Acoustic Wave Filter Layout With Ground Layers for Signal Isolation
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Solution Overview
Problem
Existing electronic components with two circuit sections using acoustic wave elements face challenges in miniaturization and cost reduction due to the need for physically separated resonators, which increases size and cost.
Innovation Solution
An electronic component design featuring a first main body with stacked dielectric layers and a second main body with acoustic wave circuit sections, where ground conductor layers are strategically placed between the circuit sections to reduce electromagnetic coupling and minimize size while maintaining effective signal filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two physically separated acoustic wave resonators are used to reduce electromagnetic coupling, then signal isolation is improved, but the overall size of the branching filter increases
Solution Approach 1:
The patent transitions from planar separation to three-dimensional stacking by placing acoustic wave resonators on different layers (first and second main bodies) separated by ground conductor layers. This vertical arrangement in the stacking direction enables effective electromagnetic isolation while maintaining a compact footprint area, directly resolving the contradiction between signal isolation and overall size.
Solution Approach 2:
Ground conductor layers are introduced as intermediary elements between the first and second acoustic wave resonators. These ground layers act as electromagnetic shields that block coupling between the resonators, enabling compact placement without compromising signal isolation. The ground conductor layers serve as the mediating structure that allows close proximity while maintaining isolation.
2Reliability
If two physically separated acoustic wave resonators are used, then electromagnetic coupling is reduced, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple functions into integrated structures: the ground conductor layers serve both as electromagnetic shields and as part of the signal transmission path, while the stacked main bodies combine multiple resonators and filtering functions in a single assembly. This integration reduces the number of separate components and assembly steps, lowering manufacturing cost while maintaining electromagnetic coupling control.
Solution Approach 2:
The ground conductor layers perform multiple functions simultaneously: they provide electromagnetic shielding between resonators, serve as reference planes for signal transmission, and act as part of the filtering structure. This multi-functionality reduces the need for additional dedicated isolation components, simplifying manufacturing and reducing cost.
3Volume of moving object
If ground conductor layers are added between circuit sections, then electromagnetic coupling is reduced and miniaturization is enabled, but structural complexity increases
Solution Approach 1:
The patent segments the branching filter into distinct stacked main bodies (first and second main bodies) with ground conductor layers between them. This segmentation creates modular units that can be independently designed and manufactured, then assembled together. While it adds layers, it organizes complexity into manageable segments rather than a monolithic structure.
Solution Approach 2:
The patent implements a nested structure where ground conductor layers are embedded within the stack of dielectric layers and main bodies. The ground layers are positioned at specific depths within the stacked structure, nested between functional elements rather than added as external components. This nesting integrates the isolation function into the existing structure without adding significant external complexity.
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 design achieves miniaturization and cost reduction by reducing electromagnetic coupling and allowing for efficient signal filtering, as demonstrated by simulation results showing high isolation and attenuation characteristics.
Implementation Method 1
The first main body includes at least one ground conductor layer located between the first and second circuit sections when seen in a first direction parallel to a direction in which the first and second main bodies are arranged
Implementation Method 2
An acoustic wave resonator refers to a resonator constituted by using an acoustic wave element. An acoustic wave element refers to an element using acoustic waves
Data Source
AI summary
An electronic component includes a first main body including a plurality of dielectric layers stacked together, and a second main body mounted to the first main body. The second main body includes a first circuit section and a second circuit section that are each constituted by using at least one acoustic wave element and are electrically separated from each other. The first main body includes first to third ground conductor lavers located between the first and second circuit sections when seen in a Z direction.