Communication Module Shielding Layout for Radiated Noise Reduction
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Solution Overview
Problem
Current methods for reducing radiated noise in electronic devices, such as digital cameras, are inadequate, leading to potential erroneous operations due to interference from electric field noise generated by communication modules.
Innovation Solution
A communication module design featuring a first wiring board with signal lines and a ground line, and a second wiring board with signal lines and a shielding member, where conductive members are strategically placed between the ground line and the shielding member to overlap with signal lines, ensuring a path for return currents and reducing radiated noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a ground line is exposed from an insulating material and electrically connected to a conductor to address noises, then noise shielding is improved, but radiated noise generation remains inevitable
Solution Approach 1:
The invention transitions from a two-dimensional ground line connection to a three-dimensional shielding structure by placing a conductive member between the ground line and shielding member, creating a vertical electromagnetic field cancellation path that addresses radiated noise from multiple spatial dimensions
Solution Approach 2:
The conductive member acts as an intermediary element between the ground line and shielding member, facilitating return current flow and enabling electromagnetic field cancellation. This intermediate structure provides a controlled path for return currents, preventing them from flowing through signal lines and reducing radiated noise
2Productivity
If signal lines are used for data communication between electronic units, then data transmission is enabled, but radiated noise such as electric field noise is generated
Solution Approach 1:
The invention extracts the return current path from the signal lines themselves and separates it into a dedicated ground path through the conductive member. By taking out the return current flow from the signal transmission path, the signal lines can maintain their data communication function while the extracted return current flows through the conductive member, reducing electromagnetic radiation
Solution Approach 2:
The invention converts the harmful radiated noise generated by return currents into a beneficial cancellation effect. By providing a controlled return current path through the conductive member positioned between the ground line and shielding member, the return currents generate electromagnetic fields that cancel the fields from signal currents, transforming noise generation into noise cancellation
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 reduces radiated noise, minimizing interference with wireless communication units and ensuring stable wireless communication by canceling electric fields generated by signal and return currents.
Implementation Method 1
at least one conductive member provided between the first ground line and the shielding member... effectively reduces radiated noise, minimizing interference with wireless communication units and ensuring stable wireless communication by canceling electric fields generated by signal and return currents
Data Source
AI summary
A communication module includes a first wiring board including a plurality of first signal lines and a first ground line, and a second wiring board including a first layer and a second layer. The first layer includes a plurality of second signal lines. The second layer includes a shielding member. The communication module includes a plurality of first connection members via which the plurality of first signal lines are electrically connected to the plurality of second signal lines, and at least one conductive member provided between the first ground line and the shielding member. The at least one conductive member is provided so as to overlap with at least one second signal line among the plurality of second signal lines as viewed in a direction perpendicular to a main surface of the first wiring board.