Differential Wiring Base Layout for High-Frequency Impedance Matching
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Solution Overview
Problem
Electronic devices face challenges in transmitting high-frequency signals effectively due to noise resistance and impedance matching issues in existing wiring configurations, particularly in high-frequency bands above 10 GHz.
Innovation Solution
A wiring base design featuring a dielectric insulation base with side-by-side differential-wiring channels and strategically positioned films to manage bonding material flow and increase grounded surface area, enhancing noise resistance and impedance matching for stable high-frequency signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple differential-wiring channels are disposed next to each other to improve high-frequency transmission, then data transmission speed increases, but noise resistance deteriorates due to interference between adjacent channels
Solution Approach 1:
A non-conductive film is introduced as an intermediary layer between adjacent differential-wiring channels. This film acts as a barrier that prevents bonding material from spreading between channels, thereby reducing electromagnetic interference and improving noise resistance while maintaining high-frequency transmission capabilities
Solution Approach 2:
The patent applies different properties to different regions: the non-conductive film is specifically positioned between grounding conductors of adjacent channels to provide localized insulation, while signal conductors maintain their conductivity. This localized differentiation allows high-speed transmission while preventing noise interference at critical interfaces
2Reliability
If grounding conductors are positioned adjacent to each other for effective grounding, then grounding efficiency improves, but bonding material spreads between conductors causing impedance mismatch
Solution Approach 1:
A non-conductive film is placed between adjacent grounding conductors to prevent bonding material from spreading across the boundary. This intermediary layer ensures that each grounding conductor maintains its designated bonding area, preventing impedance mismatch while preserving effective grounding through multiple adjacent conductors
Solution Approach 2:
The bonding interface is segmented into distinct regions by the non-conductive film, with each grounding conductor having its own dedicated bonding area. This segmentation prevents bonding material from mixing between adjacent conductors, ensuring uniform bonding strength and consistent impedance characteristics across all channels
3Reliability
If bonding material is applied to connect conductors to the insulation base, then electrical connection is established, but uneven bonding strength results in signal conductor detachment
Solution Approach 1:
A thin non-conductive film is applied over the bonding material between the conductor and insulation base. This film constrains the bonding material within a specific area, ensuring uniform distribution and consistent bonding strength across the entire bonding interface, thereby preventing signal conductor detachment
Solution Approach 2:
The non-conductive film is positioned beforehand on the insulation base before bonding material is applied. This preliminary placement creates predefined bonding boundaries that guide the bonding material to spread uniformly, ensuring consistent electrical connection strength before the actual bonding process occurs
Data Source
AI summary
A wiring base includes an insulation base having a first surface, a first differential-wiring channel, and a second differential-wiring channel. The first and the second differential-wiring channels are on the first surface and arranged side by side in a first direction. The first differential-wiring channel includes a pair of first signal conductors extending in a second direction intersecting the first direction and a pair of first grounding conductors extending along the first signal conductors with the first signal conductors being interposed therebetween. The second differential-wiring channel includes a pair of second signal conductors extending in the second direction and a pair of second grounding conductors extending along the second signal conductors with the second signal conductors being interposed therebetween. The wiring base further includes a first film extending in the second direction and positioned between first and second grounding conductors adjacent to each other in plan of the first surface.