High-Frequency Transmission Line Crosstalk Reduction
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Solution Overview
Problem
Conventional high-frequency transmission lines face challenges in crossing signal lines without increasing thickness and minimizing crosstalk, as overlapping laminates result in thickness increase and crosstalk occurs when signal lines are opposed within a laminate.
Innovation Solution
A high-frequency transmission line design featuring a laminate with a first signal line, a second signal line crossing the first, and an intermediate ground conductor between them, positioned on the same dielectric layer except at the crossing portion, to overlap and reduce thickness and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two signal lines are crossed by overlapping laminates, then the signal lines can be routed independently, but the thickness at the crossing portion significantly increases
Solution Approach 1:
The patent transitions from a two-dimensional laminate stacking approach to a three-dimensional integrated structure. Multiple signal lines are routed within the same dielectric layer rather than stacking laminates, utilizing the planar dimension to achieve routing flexibility while maintaining constant thickness.
Solution Approach 2:
The patent merges multiple signal line routing functions into a single dielectric layer, combining what would traditionally require separate laminates. This integration eliminates the thickness increase associated with laminate stacking while preserving routing independence through proper spacing and grounding.
2Length of stationary object
If two signal lines are provided in a single laminate to cross each other, then the thickness at crossing portion is reduced, but crosstalk occurs between the signal lines
Solution Approach 1:
The patent introduces ground conductors as intermediary elements between crossing signal lines. These ground conductors act as shields that electrically isolate the signal lines, preventing crosstalk while allowing them to occupy the same dielectric layer and maintain reduced thickness.
Solution Approach 2:
The patent applies different functional zones within the dielectric layer: signal transmission zones for the signal lines and shielding zones for the ground conductors. This local differentiation allows crossing signal lines to coexist without crosstalk by providing electromagnetic isolation precisely where needed.
3Object-affected harmful factors
If signal lines are positioned between ground conductors in a stripline structure, then electromagnetic shielding is improved, but the structure becomes more complex
Solution Approach 1:
The patent makes the ground conductors serve multiple functions: they provide electromagnetic shielding for the stripline structure, act as intermediaries to prevent crosstalk at crossing portions, and maintain characteristic impedance. This multi-functionality reduces overall structure complexity by eliminating the need for separate shielding elements.
Data Source
AI summary
A high-frequency transmission line includes a laminate including dielectric layers, a first signal line provided on one of the dielectric layers, a second signal line crossing the first signal line when viewed in a plan view in a direction of lamination, the second signal line being positioned on the same dielectric layer as the first signal line except for a crossing portion that crosses with the first signal line, and an intermediate ground conductor provided between the first and second signal lines in the direction of lamination, so as to overlap with crossing portions of the first and second signal lines when viewed in a plan view in the direction of lamination.