Acoustic Wave Branching Filter Layout to Suppress Floating Inductance
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Solution Overview
Problem
Existing branching filters in compact communication apparatuses face challenges in achieving desired characteristics due to long paths from acoustic wave elements to ground terminals, leading to increased floating inductance and difficulty in adjustment.
Innovation Solution
The electronic component includes a first main body with stacked dielectric layers and a second main body with acoustic wave elements connected in parallel to a circuit section, where the acoustic wave elements are not electrically connected to the ground, allowing for easier achievement of desired characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the acoustic wave element is electrically connected to the ground terminal via inside of the stack, then the branching filter can be downsized, but the path from the acoustic wave element to the ground terminal becomes relatively long, leading to increased floating inductance and difficulty in achieving desired characteristics
Solution Approach 1:
The acoustic wave element is extracted from the ground connection path by connecting it to the signal terminal instead of the ground terminal, thereby removing the source of floating inductance while maintaining the compact stack structure
Solution Approach 2:
Instead of connecting the acoustic wave element to the ground terminal as in conventional designs, the invention inverts the connection approach by connecting it to the signal terminal, which eliminates the floating inductance issue while maintaining downsizing benefits
2Device complexity
If the acoustic wave element is connected to the ground terminal, then the structure is simplified, but the long connection path causes increased floating inductance that makes adjustment difficult
Solution Approach 1:
The problematic ground connection path is extracted and replaced with a direct signal terminal connection, eliminating floating inductance while keeping the overall connection structure simple and manufacturable
3Device complexity
If the acoustic wave element is connected in parallel with the inductor through a long path, then the filter structure is formed, but the long path increases floating inductance and causes coupling between inductors and acoustic wave elements
Solution Approach 1:
The harmful long connection path is extracted and replaced with a direct connection to the signal terminal, eliminating floating inductance and unwanted coupling effects while maintaining the necessary filter structure
Solution Approach 2:
The invention converts the potential harm of direct parallel connection into a benefit by connecting the acoustic wave element to the signal terminal instead of ground, which eliminates floating inductance while maintaining the parallel resonance functionality needed for filter operation
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 enables easier adjustment and achievement of desired characteristics in branching filters, addressing the challenge of long paths and floating inductance.
Implementation Method 1
The second main body includes at least one acoustic wave element that is electrically connected to the circuit section
Data Source
AI summary
An electronic component includes a first main body and a second main body mounted on the first main body. The first main body includes a common terminal, a second signal terminal, and a circuit section including first to fourth inductors. The second main body includes first to third acoustic wave elements electrically connected to the circuit section. The first acoustic wave element is connected in parallel with the first inductor. The second acoustic wave element is connected in parallel with the second and third inductors. The third acoustic wave element is connected in parallel with the fourth inductor. The first to third acoustic wave elements, in a state of being electrically connected to the circuit section, are not electrically connected to the ground.