Duplexer Matching Inductor Layout for Better RF Isolation
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Solution Overview
Problem
In transmission and reception modules, magnetic flux coupling between inductors in matching circuits leads to degradation of isolation and attenuation characteristics, affecting signal performance.
Innovation Solution
The module design includes first and second inductors with winding axis directions oriented differently to minimize magnetic flux coupling, thereby reducing mutual inductance components and maintaining signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If inductors are placed close together in matching circuits, then device integration is improved, but magnetic flux coupling increases causing degradation of isolation and attenuation characteristics
Solution Approach 1:
The patent applies asymmetry by orienting the winding axes of adjacent inductors in different directions (e.g., one inductor with winding axis in the first direction, another with winding axis in the second direction perpendicular to the first). This asymmetric arrangement breaks the symmetry of magnetic flux coupling paths, significantly reducing mutual inductance between closely spaced inductors while maintaining compact integration.
Solution Approach 2:
The patent transitions from planar (2D) inductor arrangement to three-dimensional (3D) spatial orientation by utilizing vertical stacking with different winding axis orientations. Inductors are arranged in multiple layers with their winding axes oriented in different directions (e.g., X-axis, Y-axis, or Z-axis), effectively using the third dimension to reduce magnetic coupling while maintaining compact footprint.
2Device complexity
If inductors are placed close together in matching circuits, then device integration is improved, but magnetic flux coupling increases causing degradation of attenuation characteristics
Solution Approach 1:
The patent applies asymmetry by orienting the winding axes of adjacent inductors in different directions (e.g., one inductor with winding axis in the first direction, another with winding axis in the second direction perpendicular to the first). This asymmetric arrangement breaks the symmetry of magnetic flux coupling paths, significantly reducing mutual inductance between closely spaced inductors while maintaining compact integration.
Solution Approach 2:
The patent transitions from planar (2D) inductor arrangement to three-dimensional (3D) spatial orientation by utilizing vertical stacking with different winding axis orientations. Inductors are arranged in multiple layers with their winding axes oriented in different directions (e.g., X-axis, Y-axis, or Z-axis), effectively using the third dimension to reduce magnetic coupling while maintaining compact footprint.
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 suppresses degradation of attenuation and isolation performance, enhancing signal quality by minimizing mutual inductance effects between inductors.
Implementation Method 1
magnetic flux coupling is generated between inductors included in the respective matching circuits
Implementation Method 2
minimizing mutual inductance effects between inductors
Data Source
AI summary
A transmission and reception module includes a substrate including a transmission signal input terminal, a reception signal output terminal, and an antenna terminal, a duplexer that is provided on the substrate, outputs a transmission signal input from the transmission signal input terminal to the antenna terminal, and outputs a reception signal input from the antenna terminal to the reception signal output terminal, a first inductor included in a first matching circuit provided between the duplexer and the antenna terminal, and a second inductor included in a second matching circuit provided between the duplexer and the reception signal output terminal. On the substrate, a winding axis direction of a conductor of the first inductor and a winding axis direction of a conductor of the second inductor are different from each other.