PCB Connector Height Compensation and Signal Isolation
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Solution Overview
Problem
In electronic devices, the arrangement of printed circuit boards with varying heights and the use of flexible printed circuit boards for high-frequency signal transmission face challenges such as impedance deviations and increased material costs due to the need for dedicated connectors and mechanisms, which can restrict mounting space and introduce noise signals.
Innovation Solution
The implementation of a printed circuit board with connectors attached to the side wall of a mechanism inside the electronic device, allowing for flexible and rigid printed circuit boards to be connected in a way that compensates for height differences and separates signal lines by type, preventing noise interference and reducing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible printed circuit boards are used to connect rigid printed circuit boards with different arrangement heights, then the steps between different高度的PCBs can be compensated, but impedance deviation occurs due to air layer thickness variation and transmission loss increases
Solution Approach 1:
The patent divides the connection structure into multiple rigid PCB segments at different heights, connected through rigid-to-rigid connectors rather than using a single flexible PCB. This segmentation allows each rigid PCB to maintain stable impedance characteristics while the connector system accommodates the height differences, thus resolving the contradiction between adaptability and signal reliability.
Solution Approach 2:
The patent introduces rigid-to-rigid connectors as intermediary components between rigid PCBs at different heights. These connectors serve as mediators that provide stable electrical connection and consistent impedance matching, eliminating the impedance deviation and transmission loss issues caused by using flexible PCBs as intermediaries.
2Reliability
If coaxial cable with dedicated connector is used for high-frequency signal transmission, then transmission loss is reduced, but material costs increase and mounting space is restricted
Solution Approach 1:
The patent merges the connector functionality directly into the rigid PCB structure through rigid-to-rigid connectors, eliminating the need for separate coaxial cables and dedicated connectors. This integration maintains stable signal transmission by providing consistent impedance matching while reducing material costs and simplifying the overall device structure by removing unnecessary components.
Solution Approach 2:
The patent extracts the high-frequency signal transmission function from the flexible PCB and implements it through rigid PCBs with integrated rigid-to-rigid connectors. This extraction eliminates the need for complex coaxial cable mechanisms while maintaining signal integrity, thus reducing device complexity and material costs while preserving transmission quality.
3Area of stationary object
If signal lines are closely arranged on flexible printed circuit board, then space is saved, but coupling phenomenon occurs between adjacent signal lines causing transmission loss
Solution Approach 1:
The patent applies different structural qualities to different signal transmission needs by using rigid-to-rigid connectors with optimized signal line arrangements. The rigid PCB structure provides stable impedance control and reduced coupling effects compared to flexible PCBs, allowing for compact space utilization while maintaining signal transmission quality through locally optimized connector designs.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An electronic device 100 is provided. The electronic device includes a housing 110 comprising a first surface that faces a first direction, a second surface that faces a second direction, and a side surface 115, 116 between the first surface and the second surface, a first printed circuit board 130 seated inside the housing, and a second printed circuit board 150 seated inside the housing such that a height of the second printed circuit board from the second surface is different from that of the first printed circuit board, wherein the first printed circuit board includes a mounting part 131 on which at least one component is mounted, a first connector 133 which extends from a first part of the mounting part. A portion 133c of the first connector being substantially perpendicular to the mounting part and configured to be connected to the second printed circuit board, and a second connector 135 which extends from a second part of the mounting part and configured to be connected to the second printed circuit board.