Transmission Line Bending Durability via Segmented Dielectric Design
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Solution Overview
Problem
Transmission lines in foldable wireless communication terminals suffer from damage due to stress accumulation when bent multiple times, leading to cracks in the dielectric and loss of high-frequency transmission functionality.
Innovation Solution
A transmission line design with a strip or micro-strip structure divided into a base part and a bending part, featuring multiple dielectrics and protective sheets to distribute stress and prevent damage, including a second dielectric with a greater radius of curvature to absorb stress, protective sheets to separate dielectrics, and additional dielectrics with varying thicknesses to enhance elastic force and minimize friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmission line is bent multiple times in a foldable terminal, then the terminal achieves foldability and compactness, but stress accumulates in the bending part causing damage to the dielectric and signal line
Solution Approach 1:
The transmission line is divided into a base part and a bending part, with the dielectric layer segmented to allow relative movement. The signal line is separated from the dielectric layer in the bending part, enabling independent deformation of each component during folding, thus reducing stress accumulation and preventing damage while maintaining foldability.
2Device complexity
If the signal line is located in the dielectric of the bending part, then the transmission line structure is simplified, but cracks occur in the signal line when the dielectric is stressed
Solution Approach 1:
The signal line is extracted from the dielectric layer in the bending part, allowing the dielectric to deform independently without causing cracks in the signal line. This separation maintains structural simplicity while ensuring signal transmission reliability during repeated bending operations.
3Reliability
If multiple dielectrics and protective sheets are added to distribute stress, then bending durability is improved, but the device complexity increases
Solution Approach 1:
The complex multi-layer structure with different dielectrics and protective sheets is applied specifically in the bending part where stress concentration occurs, while the base part maintains a simpler structure. This localized approach improves bending durability without unnecessarily increasing overall device complexity.
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 design effectively prevents damage to the transmission line during repeated bending by distributing stress and reducing friction, maintaining high-frequency functionality and reducing the risk of cracking in the dielectric.
Implementation Method 1
a second dielectric with a greater radius of curvature to absorb stress
Implementation Method 2
protective sheets to separate dielectrics, and additional dielectrics with varying thicknesses to enhance elastic force and minimize friction
Data Source
AI summary
The present invention relates to a transmission line having improved bending durability, which includes a strip structure or a micro-strip structure that is divided into a base part and a bending part that is bent and unfolded based on the base part, wherein the base part and the bending part include a signal line configured to extend in a length direction so as to transmit a high frequency signal, a first dielectric of which an upper surface or a lower surface is provided with the signal line formed thereon, and a second dielectric formed above the first dielectric; and the second dielectric is coupled to the first dielectric in the base part and separated from the first dielectric in the bending part.