PCB Integrated EMC Shielding Enclosure for Automotive Noise
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Solution Overview
Problem
High-speed automotive networking with shielded cable channels faces challenges in electromagnetic compatibility (EMC) due to difficulties in diverting radiofrequency noise currents from cable shields to printed circuit board (PCB) grounds through connectors, and conventional shielding solutions are large and hard to implement in compact automotive environments.
Innovation Solution
A printed circuit board with an integrated EMC/EMI shielding enclosure featuring a metallic top and bottom layer deposited on the substrate, connected by a metallic side layer along its edges, which can be formed using copper plating or stitching vias, providing a compact 360-degree enclosure around the PCB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional shielding solutions are used, then EMC shielding performance is improved, but the size and complexity of the system increases significantly
Solution Approach 1:
The patent merges the shielding enclosure with the PCB by integrating the metallic shielding layers directly onto the PCB substrate. The top and bottom metallic layers are deposited directly on the PCB surfaces, and side layers are formed along the edges, effectively combining the shielding function with the PCB structure itself, eliminating the need for separate external shielding enclosures
Solution Approach 2:
The shielding structure is nested within the PCB itself, with metallic layers embedded in and on the PCB substrate. The top metallic layer is deposited on the upper surface, the bottom metallic layer on the lower surface, and side metallic layers along the edges, creating a nested shielding configuration that fits within the PCB footprint without adding external volume
2Reliability
If cable shields are connected to PCB grounds through connectors, then electrical connection is established, but RF noise currents cannot be effectively diverted causing EMC issues
Solution Approach 1:
The patent converts the harmful RF noise currents into beneficial grounding paths by providing low-impedance metallic layers that actively conduct noise currents away from sensitive circuits. The top and bottom metallic layers serve as noise sinks that capture RF interference and channel it to ground through controlled impedance paths, transforming the harmful noise into manageable current flows that can be safely dissipated
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 minimizes EMC issues by creating a compact, full 360-degree shielding enclosure that surrounds the PCB, improving EMC performance while maintaining a small form factor, reducing the size increase by only 1-5 mm compared to regular PCBs, and offering significant cost savings by using low-cost manufacturing processes.
Implementation Method 1
a metallic top layer deposited on top of the major plane of the substrate so as to envelop an uppermost layer of the substrate, a metallic bottom layer deposited on bottom of the major plane of the substrate
Implementation Method 2
the metallic side layer of the EMC/EMI shielding enclosure is formed of a copper plating electrically connecting the metallic top layer and the metallic bottom layer
Data Source
AI summary
A printed circuit board (PCB) and a method of manufacturing the same is described. The PCB includes a substrate defining a major plane and an integrated electromagnetic interference and compatibility (EMC/EMI) shielding enclosure configured to enclose the substrate. The shielding enclosure includes a metallic top layer deposited on top of the major plane of the substrate so as to envelop an uppermost layer of the substrate, a metallic bottom layer deposited on bottom of the major plane of the substrate so as to envelop a bottommost layer of the substrate, and a metallic side layer formed along a length of one or more edges of the substrate to electrically connect the metallic top layer and the metallic bottom layer.