Wiring Board Ground Layout for Low-Loss High-Frequency Signals
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Solution Overview
Problem
Existing wiring boards face challenges in maintaining low-loss transmission of high-frequency signals due to instability in ground voltage and degradation of high-frequency characteristics at signal transmission ends.
Innovation Solution
The wiring board design includes a signal conductor with inductive patterns at specific distances from ground conductors, forming a current path that matches inductance components to stabilize ground voltage and improve high-frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal conductor extends to the end portion of the substrate surface with ground conductors, then high-frequency signal transmission is enabled, but ground voltage becomes unstable and high-frequency characteristics degrade
Solution Approach 1:
The patent applies local quality by creating an inductive pattern specifically at the end portion of the signal conductor (within distance H from the end) rather than uniformly across the entire conductor. This localized inductive structure addresses the ground voltage instability problem at the critical signal transmission end while maintaining the overall simplicity of the wiring board design.
Solution Approach 2:
The patent changes the physical parameter of the conductor by forming an inductive pattern with specific geometric characteristics (loop structure or meander shape) at the end portion. This parameter change transforms the local electrical characteristics to provide inductance that stabilizes ground voltage, thereby improving high-frequency signal transmission quality without requiring complete redesign of the entire wiring structure.
2Reliability
If inductive patterns are added to the signal conductor or ground conductors, then ground voltage stability and high-frequency characteristics improve, but device complexity increases
Solution Approach 1:
The inductive pattern is applied only at the end portion of the signal conductor within distance H from the end, rather than throughout the entire conductor length. This localized approach provides the necessary inductance for ground voltage stability while minimizing the increase in overall device complexity and maintaining manufacturing simplicity.
Solution Approach 2:
The patent applies partial action by implementing the inductive pattern only where it is most needed - at the end portion of the signal conductor where high-frequency signal transmission occurs and ground voltage instability is most problematic. This partial implementation achieves the desired effect without the excessive complexity of applying inductive structures throughout the entire wiring board.
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 reduces return loss and attenuation of high-frequency signals by stabilizing ground voltage and enhancing signal transmission quality.
Implementation Method 1
At least one selected from the group consisting of the signal conductor and the first ground conductors includes a pattern disposed at a distance of equal to or greater than 1/3 of the distance H and equal to or less than the distance H from the end portion. The pattern is inductive.
Implementation Method 2
The connection conductors electrically connect respective ones of the first ground conductors to the second ground conductor.
Data Source
AI summary
A wiring board includes a base, a signal conductor, two first ground conductors, a second ground conductor, and connection conductors. The base is composed of a dielectric and includes a first surface and a second surface opposite to the first surface. The signal conductor is disposed on the first surface and extends to an end portion of the base. The two first ground conductors are disposed on the first surface and extend to the end portion with the signal conductor disposed between the first ground conductors. The second ground conductor is disposed in the base or on the second surface. The second ground conductor faces the signal conductor and extends to the end portion. The connection conductors electrically connect respective ones of the first ground conductors to the second ground conductor. The signal conductor and the second ground conductor are separated from each other by a distance H.