Integrated Coaxial Cable Flexible Circuit Board for Foldable Antenna Signal Transmission
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Solution Overview
Problem
Current flexible printed circuit boards (FPCs) and coaxial cables face challenges in meeting the transmission loss requirements for antenna signals in foldable mobile terminals, while also occupying excessive space due to large connectors.
Innovation Solution
A flexible printed circuit board design that integrates a coaxial cable within its body part, with terminals for external connection, reducing transmission loss and space occupancy by eliminating the need for large connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FPC is used to connect the two ends of the folding structure, then the structure can be connected, but the transmission loss requirement of the antenna signal cannot be met
Solution Approach 1:
The patent combines the FPC and coaxial cable into an integrated structure where the coaxial cable is embedded within the FPC body. This merging allows the system to simultaneously achieve the connection capability of FPC and the low transmission loss of coaxial cable, resolving the contradiction between reliability and ease of manufacture.
Solution Approach 2:
The patent uses a composite structure combining FPC material and coaxial cable in one integrated component. This composite approach enables the connection function while maintaining signal transmission quality, as the coaxial cable portion provides low-loss transmission while the FPC provides flexibility and connection capability.
2Reliability
If coaxial cable is used to connect to PCB board, then transmission loss is reduced, but large-size connector is needed which increases device size
Solution Approach 1:
The patent merges the coaxial cable with the FPC structure, eliminating the need for separate large connectors. The integrated design allows the coaxial cable to connect directly to the PCB through the FPC's existing connection interface, reducing the overall device size while maintaining low transmission loss.
Solution Approach 2:
The FPC serves multiple functions: it provides structural support, enables flexible connection, and integrates the coaxial cable for low-loss signal transmission. This multi-functionality eliminates the need for dedicated large connectors, thereby reducing device size while maintaining transmission quality.
3Reliability
If antennas are distributed at two ends of the folding structure, then communication performance is improved, but transmission loss increases due to cable length
Solution Approach 1:
The patent uses the composite FPC-coaxial cable structure to distribute antennas at two ends while minimizing transmission loss. The coaxial cable portion of the integrated structure provides low-loss signal transmission over the required distance, enabling antenna distribution for improved communication performance without excessive energy loss.
Data Source
AI summary
This application discloses a flexible printed circuit board and an electronic device. The flexible printed circuit board includes a body part, a coaxial cable, and a terminal disposed in the body part. The coaxial cable is disposed in the body part, and at least one end of the coaxial cable is electrically connected to outside by using the terminal.