Foldable RF Transmission Line Slit Structure for Bending Durability
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Solution Overview
Problem
Foldable electronic devices face challenges in maintaining signal transmission performance due to the durability requirements of radio frequency transmission lines that need to withstand repeated bending operations.
Innovation Solution
A radio frequency transmission line with a slit structure is used, formed on a flexible substrate, which allows for bending without compromising signal transmission performance by reducing thickness in the bending area, enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radio frequency transmission line is made thick to maintain signal transmission performance, then signal transmission quality is improved, but durability against bending operations deteriorates
Solution Approach 1:
The transmission line is divided into a first transmission line portion and a second transmission line portion separated by a groove. This segmentation allows each portion to be optimized independently - the first portion maintains sufficient thickness for signal transmission while the second portion can be thinner to accommodate bending, thus resolving the contradiction between signal quality and bending durability
Solution Approach 2:
Different portions of the transmission line are given different thickness characteristics. The first transmission line portion has greater thickness for optimal signal transmission, while the second portion has reduced thickness for bending flexibility. This local differentiation allows each region to fulfill its specific function without compromising the other
2Strength
If the thickness of the radio frequency transmission line is reduced to improve bending durability, then durability against bending operations is improved, but signal transmission performance deteriorates
Solution Approach 1:
The transmission line is segmented into two portions with a groove between them, enabling the first portion to maintain greater thickness for signal transmission while the second portion has reduced thickness for bending durability
Solution Approach 2:
The transmission line structure implements local quality differentiation where the first portion has optimized thickness for electromagnetic signal transmission and the second portion has reduced thickness for mechanical flexibility, allowing each region to optimize its specific function
3Strength
If a slit structure is introduced to improve bending durability, then durability against bending operations is improved, but signal transmission performance may deteriorate
Solution Approach 1:
The groove is formed in advance in the substrate before the transmission line portions are established, creating a predetermined separation that allows the transmission line to bend without stress concentration. This preliminary structural preparation enables bending durability while maintaining signal transmission integrity
Solution Approach 2:
The groove structure creates a virtual separation that allows the transmission line to effectively 'copy' the bending motion without physical stress, as the groove provides a compliance zone that accommodates deformation while the transmission line portions maintain their signal transmission function
Data Source
AI summary
An electronic device according to various embodiments of the present invention may comprise: a first housing; a hinge part having a first surface connected to the first housing; a second housing connected to a second surface of the hinge part opposite to the first surface; and a wiring member for electrically connecting the first housing and the second housing. The wiring member may be folded or unfolded on the basis of the hinge part, and a slit may be formed to correspond to at least a portion of the folded or unfolded bending area. In addition, other embodiments are possible.