Flat Cable Via-Hole Segmentation for RF Signal Integrity
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Solution Overview
Problem
Conventional flat cables experience deterioration in transmission characteristics due to current concentration near via-hole conductors, leading to increased resistance and unwanted resonance, which affects the transmission of radio frequency signals.
Innovation Solution
The flat cable design includes interlayer connection conductors that guide countercurrents to the first ground conductor in a dispersed manner, preventing current concentration on via-hole conductors, and features a triplate structure with elongated conductors and bridge conductors connected by via-hole conductors positioned to redirect currents effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If via-hole conductors are used to connect ground conductors in conventional flat cables, then the ground conductors are electrically connected, but current concentration occurs near the via-hole conductors leading to increased resistance and unwanted resonance
Solution Approach 1:
The invention divides the single via-hole connection into multiple via-hole conductors distributed along the bridge conductor. This segmentation disperses the current flow path, preventing current concentration at a single point and reducing the associated resistance increase and unwanted resonance effects.
Solution Approach 2:
The invention applies different connection configurations at different locations along the bridge conductor. Multiple via-hole conductors are strategically positioned to create localized current distribution patterns that prevent concentration, while maintaining overall electrical connectivity between ground conductors.
2Length of stationary object
If flat cable is used instead of coaxial cable, then the cable thickness is reduced for smaller terminal housing gaps, but transmission characteristics deteriorate due to current concentration issues
Solution Approach 1:
By segmenting the ground conductor connection into multiple via-hole conductors, the invention resolves the transmission characteristic deterioration that would otherwise occur in thin flat cables, enabling the use of flat cable geometry without sacrificing RF performance.
Solution Approach 2:
The invention converts the potential harmful effect of current concentration into a beneficial distributed current flow pattern. The multiple via-hole conductors transform what would be a resistance-increasing concentration point into a series of distributed connection points that maintain low overall resistance and prevent resonance.
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
This configuration significantly reduces transmission loss and prevents unwanted resonance, ensuring excellent radio frequency transmission characteristics by dispersing countercurrents and maintaining low resistance across the signal conductor.
Implementation Method 1
The interlayer connection conductor is provided in the base material so as to connect the first ground conductor and the second ground conductor
Implementation Method 2
each of the plurality of via-hole conductors 511P, 512P, 521P, and 522P is disposed at the center position in the width direction (direction parallel to the first direction) of the corresponding bridge conductor 33
Data Source
AI summary
A flat cable includes a base material including a signal conductor extending in a first direction, a first ground conductor, and a second ground conductor. The second ground conductor includes elongated conductors extending in the first direction, and bridge conductors that connect the elongated conductors at predetermined spacings along the first direction. The second ground conductor is connected with via-hole conductors at predetermined positions in two mutually opposite directions along the first direction with respect to each of the bridge conductors. Countercurrents generated from a plurality of countercurrent generation points do not flow to the first ground conductor via a common via-hole but flow to the first ground conductor individually via separate via-hole conductors.