FPC Board RF Interconnection Reinforcement
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Solution Overview
Problem
Flexible printed circuit (FPC) boards used to connect high-speed electrical or optical modules are prone to breakage due to bending, as their micro-strip and co-planar lines are easily damaged by the flexing of the board, especially when carrying signals exceeding 10 Gbps.
Innovation Solution
The FPC board design includes top and back electrodes with extended portions and via holes for electrical connection, where the top RF electrode and top ground electrode extend interconnections and are connected to corresponding back electrodes through via holes, with the back ground electrode forming a gap to the back RF electrode, enhancing the board's structural integrity and signal transmission capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the FPC board uses micro-strip line and/or co-planar line arrangement for high-speed signal transmission, then signal transmission quality is improved, but the line becomes slim and is easily broken due to bending
Solution Approach 1:
The patent divides the ground electrode into multiple segments (first ground electrode, second ground electrode, third ground electrode) that are electrically connected through via holes. This segmentation allows the ground electrodes to extend beyond the RF electrodes, providing mechanical reinforcement without compromising the micro-strip line structure needed for high-speed signal transmission.
Solution Approach 2:
The patent extends the ground electrodes in the width direction (perpendicular to the signal transmission direction) beyond the RF electrodes. This dimensional extension creates an extended portion that reinforces the FPC board against bending without interfering with the slim RF interconnections needed for high-speed signals.
2Speed
If the line on the FPC board is made slim for high-speed signal transmission, then signal transmission capability is improved, but the line becomes easily broken due to bending
Solution Approach 1:
The ground electrode is segmented into multiple parts connected by via holes, allowing each segment to extend beyond the RF electrodes and provide mechanical support while maintaining the slim profile of the RF interconnections for high-speed signal transmission.
Solution Approach 2:
The extended ground electrodes act as intermediary structural elements that provide mechanical reinforcement to the FPC board without directly interfering with the RF signal transmission paths, thus protecting the slim RF lines from bending-induced breakage.
3Adaptability or versatility
If the FPC board is bent for flexibility, then adaptability is improved, but the micro-strip line and co-planar line are easily broken
Solution Approach 1:
The ground electrodes are extended in the width direction beyond the RF electrodes, creating an extended portion that acts as a mechanical reinforcement structure. This extension provides resistance to bending forces while allowing the FPC board to maintain its flexibility for various mounting configurations.
Solution Approach 2:
The FPC board structure combines the flexible substrate with extended ground electrode patterns that provide mechanical strength. This composite structure maintains the flexibility needed for adaptability while the extended ground electrodes prevent interconnection breakage during bending.
Data Source
AI summary
A flexible printed circuit (FPC) board having reinforcing pattern against bending is disclosed. The FPC board provides an RF interconnection extending from an RF electrode. Two ground electrodes are formed in respective sides of the RF electrode. The ground electrodes extend respective extended portions along the RF interconnection to protect the RF interconnection from breakage due to bending of the FPC board. The extended portion provides an end portion bent toward the RF interconnection to compensate for impedance mismatching of the RF interconnection.