Floating Metal Isolation for Circuit Board Signal Interference
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Solution Overview
Problem
Existing circuit board designs face challenges in reducing interference between different frequency bands, leading to electromagnetic interference issues, which are exacerbated by the use of ground lines and require additional filters, increasing design costs.
Innovation Solution
A circuit board structure that incorporates a section of floating metal between signal transmission lines, with adjusted spacings to prevent ground current flow and reduce electromagnetic interference, thereby enhancing isolation without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ground lines are used to isolate signal lines, then isolation between signal lines is improved, but electromagnetic interference increases due to noise flowing through the ground path
Solution Approach 1:
The patent extracts and removes the ground lines from the circuit board structure between the two signal lines. By eliminating the ground lines, the patent prevents noise from flowing through the ground path while maintaining isolation between signal lines through increased spacing and floating metal structures.
Solution Approach 2:
The patent introduces floating metal structures as intermediaries between the signal lines. These floating metals (first floating metal and second floating metal) are disposed in the insulating layer without electrical connection to ground, serving as mediators that maintain electrical isolation while preventing noise coupling through the ground path.
2Object-generated harmful factors
If additional filters are added to prevent electromagnetic interference, then electromagnetic interference is reduced, but design cost increases
Solution Approach 1:
The patent implements a self-service solution where the circuit board structure itself provides electromagnetic interference protection through its geometric design. The isolated signal line arrangement with floating metals and increased spacing creates inherent noise immunity without requiring external filter components, making the structure self-protecting against EMI.
Solution Approach 2:
The patent extracts and eliminates the need for additional filter components by redesigning the fundamental signal line isolation approach. By removing ground lines and using floating metal structures with increased spacing, the patent achieves EMI protection without any additional passive components.
3Object-affected harmful factors
If distance between signal lines is increased to improve isolation, then isolation is improved, but PCB area increases
Solution Approach 1:
The patent moves the isolation mechanism from the horizontal plane to the vertical dimension by introducing floating metal structures in the insulating layer. This allows for effective isolation with reduced horizontal spacing, as the floating metals create electrical separation in the vertical dimension while maintaining compact horizontal layout.
Solution Approach 2:
The patent applies local quality by introducing floating metal structures specifically in the regions between signal lines where isolation is needed, rather than uniformly increasing spacing across the entire PCB. This targeted approach provides enhanced isolation where required while maintaining compact overall layout.
Data Source
AI summary
A circuit board structure for improving isolation is provided. The circuit board structure can increase the isolation by adding a section of floating metal between two signal transmission lines and adjusting the distance between the floating metal and the two signal transmission lines.