Inter-Board Connector Shielding for PCB Radiation Noise
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Solution Overview
Problem
Existing board coupling structures fail to effectively suppress unwanted radiation noise caused by high-frequency signals flowing through inter-board connectors, despite the use of conductive members to manage electrostatic discharge noise.
Innovation Solution
A circuit board unit comprising a first and second circuit board with ground layers, a connector unit, and a metal member that electrically couples the boards and covers the connector unit, providing a facing wall section that overlaps with both circuit boards and facilitates the propagation of return currents to suppress radiation noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal member covers the connector unit and couples ground layers, then radiation noise is suppressed, but the structure becomes more complex
Solution Approach 1:
The coupling function and shielding function are merged into a single metal member. The coupling section and cover section are integrated, eliminating the need for separate components and reducing overall structural complexity while maintaining both functions.
Solution Approach 2:
The metal member performs both coupling and shielding functions, reducing the total number of components needed. This multi-functionality simplifies the overall structure compared to using separate components for each function.
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 solution effectively suppresses unwanted radiation noise by providing a return path for currents through the metal member, balancing the energy of signals flowing through the connector unit and preventing excessive noise generation.
Implementation Method 1
unwanted radiation noise, that is, electromagnetic noise is likely to be produced
Implementation Method 2
a first coupling section electrically coupled to the first ground layer, a second coupling section electrically coupled to the second ground layer
Data Source
Figure 1
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AI summary
A circuit board unit 60 includes a first circuit board 61, a second circuit board 62, a connector unit 70 including a first connector 71 attached to the first circuit board and a second connector 72 attached to the second circuit board, and a metal member 80 that couples the first circuit board and the second circuit board to each other. The metal member includes a first coupling section electrically coupled to a first ground layer of the first circuit board, a second coupling section electrically coupled to a second ground layer of the second circuit board, and a cover section 80a that covers at least a part of the connector unit. The cover section includes a facing wall section 81 at least a part of which faces the connector unit in a direction perpendicular to plate surfaces of the first circuit board. The facing wall section overlaps with the first circuit board when viewed in the direction perpendicular to the plate surfaces of the first circuit board, and overlaps with the second circuit board when viewed in a direction perpendicular to plate surfaces of the second circuit board.