Transmission Reception Module Inductor Layout for Signal Isolation
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Solution Overview
Problem
In transmission/reception modules, magnetic flux coupling between inductors in matching and input/output filter circuits leads to deterioration in isolation and attenuation characteristics, particularly when handling multiple communication bands.
Innovation Solution
The winding axis direction of the first inductor in the input/output filter circuit is set orthogonal to the substrate, while the second and third inductors in the matching circuits are set parallel to the substrate, reducing mutual inductance components and thereby suppressing deterioration in attenuation and isolation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inductors are provided in matching circuits and input/output filter circuits, then impedance matching and signal filtering are achieved, but magnetic flux coupling occurs between inductors causing deterioration in isolation and attenuation characteristics
Solution Approach 1:
The patent applies dimensionality change by transitioning the inductor configuration from a planar arrangement (all inductors parallel to substrate) to a three-dimensional arrangement where at least one inductor is positioned vertically (orthogonally) relative to the substrate. This spatial reconfiguration in the vertical dimension reduces magnetic flux coupling between inductors, thereby improving isolation characteristics while maintaining the necessary impedance matching and filtering functions.
2Adaptability or versatility
If multiple inductors are arranged on the substrate for filter and matching circuits, then signal processing functionality is improved, but mutual inductance components increase causing performance deterioration
Solution Approach 1:
The patent resolves this contradiction by introducing vertical positioning of at least one inductor orthogonal to the substrate, creating spatial separation in the vertical dimension. This reduces mutual inductance components between inductors while preserving the multi-band signal processing functionality achieved through the network of inductors in the filter and matching circuits.
3Ease of manufacture
If inductors are configured parallel to the substrate for easy manufacturing, then manufacturing simplicity is maintained, but magnetic coupling between adjacent inductors increases
Solution Approach 1:
The patent maintains ease of manufacture by implementing the vertical inductor configuration through standard PCB techniques such as vias and vertical traces, which are conventional manufacturing methods. This vertical arrangement orthogonal to the substrate effectively reduces magnetic flux coupling between inductors while remaining compatible with existing manufacturing processes.
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 mutual inductance components, enhancing signal isolation and attenuation performance between transmission and reception signals across multiple bands.
Implementation Method 1
magnetic flux coupling occurs between an inductor constituting each matching circuit and an inductor constituting the input/output filter circuit
Data Source
AI summary
A transmission/reception module includes a substrate including a transmission signal input terminal, a reception signal output terminal, and an antenna terminal, an antenna switch circuit provided on the substrate and configured to output a transmission signal input from the transmission signal input terminal to the antenna terminal and configured to output a reception signal input from the antenna terminal to the reception signal output terminal, and a first inductor included in an input/output filter circuit provided between the antenna switch circuit and the antenna terminal. The first inductor includes a conductor whose winding axis direction is orthogonal to the substrate.