Electronic Substrate Shielding Conductor Noise Cancellation
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Solution Overview
Problem
In electronic boards with multiple cables connected between different systems, interference occurs, leading to unsuppressed noise influence due to the inability to effectively shield electromagnetic waves radiated between these cables.
Innovation Solution
The electronic board incorporates a configuration with multiple lands and a shielding conductor connected via third and fourth lands, forming symmetrical magnetic field loops to cancel out noise interference, ensuring effective noise suppression even when cables are closely connected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple cables are connected closely between different systems, then space utilization is improved, but electromagnetic wave interference and noise increase
Solution Approach 1:
A shielding conductor is introduced as an intermediary element positioned between closely connected cables. This shielding conductor acts as a mediator that blocks electromagnetic wave interference between adjacent cables, allowing them to be placed closely together without mutual interference. The shielding conductor is connected to ground through dedicated grounding lands, creating an effective electromagnetic barrier.
Solution Approach 2:
The patent converts the harmful electromagnetic radiation from cables into a controlled phenomenon by introducing shielding conductors that guide and redirect these electromagnetic fields toward ground. The grounding structure transforms the potentially harmful radiated energy into harmless current flow to ground, effectively neutralizing the interference while maintaining compact cable routing.
2Reliability
If shielding structures are added to reduce noise interference, then noise resistance is improved, but device complexity increases
Solution Approach 1:
The shielding structure is segmented into discrete components: individual shielding conductors for different cable groups, separate grounding lands for each shielding conductor, and distributed connection points. This segmentation allows the shielding function to be implemented in a modular fashion, reducing overall complexity while maintaining effectiveness. Each segment can be independently optimized and grounded.
Solution Approach 2:
Rather than implementing a uniform shielding structure throughout the entire board, the patent applies shielding conductors and grounding lands only at specific locations where cable interference occurs. The shielding is localized to critical areas with high interference potential, such as between closely routed cables connecting different systems, thereby reducing unnecessary structural complexity while maintaining noise resistance where needed.
3Object-affected harmful factors
If grounding conductors are placed close to signal lines, then electromagnetic shielding is improved, but signal distortion increases due to magnetic field coupling
Solution Approach 1:
The patent employs asymmetric positioning of grounding lands relative to shielding conductors and signal lines. The grounding lands are strategically placed at specific asymmetrical locations that optimize the cancellation of common mode currents while minimizing magnetic field coupling with signal lines. This asymmetric arrangement breaks the symmetry of magnetic field loops, reducing their effectiveness and thereby reducing signal distortion.
Solution Approach 2:
The grounding structure is designed to preemptively counteract magnetic field coupling before it can cause significant signal distortion. By providing low-impedance ground paths through strategically placed grounding lands, the patent creates preliminary counteracting currents that neutralize interfering magnetic fields before they can couple into signal lines and cause distortion.
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 reduces noise radiation and distortion in high-speed signals, enhancing noise resistance performance by canceling common mode currents and minimizing magnetic field coupling between different signal lines.
Implementation Method 1
a shielding conductor (37) connected to the third land (25) and the fourth land (27)... forming symmetrical magnetic field loops to cancel out noise interference... canceling common mode currents and minimizing magnetic field coupling
Data Source
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AI summary
An electronic board includes: a board including an upper surface ground on an upper surface; at least one first land formed on the upper surface and connected to a first signal line; at least one second land formed on the upper surface and connected to a second signal line; at least one third land disposed on the upper surface between the first land and the second land and connected to the upper surface ground; and at least one fourth land disposed on the upper surface on a side opposite to the third land and connected to the upper surface ground, the first land being interposed between the third land and the fourth land.