Segmented Signal Transmission Lines for Cryogenic Thermal Isolation
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Solution Overview
Problem
Maintaining cryogenic temperatures in high-performance computing environments is challenging due to the thermal conduction capacity of signal transmission lines, which complicates the temperature gradient between different zones.
Innovation Solution
A thermally decoupled signal transmission line is designed with segments that include a signal conductor, reference planes, and a dielectric to thermally and electrically isolate the segments, using butt or lap joints and mechanical fixtures to maintain stability, promoting capacitive coupling for reduced thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal transmission lines are made of copper or copper alloys to ensure good electrical conduction, then electrical conductivity is improved, but thermal conduction increases causing heat transfer between temperature zones
Solution Approach 1:
The signal transmission line is divided into multiple segments separated by dielectric blocks. Each segment can be made of thermally insulating materials while maintaining electrical conductivity through the dielectric coupling, thus reducing thermal conduction between zones while preserving signal transmission capability
Solution Approach 2:
Dielectric blocks are introduced as intermediary elements between copper segments. These dielectric blocks electrically couple the segments for signal transmission while thermally insulating them to prevent heat transfer between temperature zones
2Loss of energy
If dielectric blocks are used to thermally insulate signal conductors at joints, then thermal conduction is reduced, but electrical insulation between segments increases
Solution Approach 1:
The dielectric block serves as an intermediary element that simultaneously provides thermal insulation and electrical coupling. By carefully selecting dielectric materials with appropriate properties, the system achieves thermal decoupling while maintaining electrical signal transmission through capacitive or inductive coupling mechanisms
Solution Approach 2:
The invention changes the physical parameters of the transmission line by introducing dielectric materials with specific thermal and electrical properties. This allows the system to operate with reduced thermal conduction while maintaining adequate electrical conduction for signal transmission
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 design reduces heat transfer between temperature zones, stabilizes temperature, improves energy efficiency, and enhances signal quality by minimizing thermal conductivity while maintaining electrical conductivity.
Implementation Method 1
the dielectric in at least one of the first and second segments thermally and electrically insulates the signal conductor in the first segment from the signal conductor in the second segment
Implementation Method 2
the dielectric in at least one of the first and second segments thermally and electrically insulates the signal conductor in the first segment from the signal conductor in the second segment
Data Source
AI summary
A thermally decoupled signal transmission line includes a first segment and a second segment. Each of the first and second segments has an elongated body including a signal conductor, at least one reference plane, and a dielectric interposed between the signal conductor and the at least one reference plane. The first segment and second segments abut at a joint. At the joint, the dielectric in at least one of the first and second segments thermally and electrically insulates the signal conductor in the first segment from the signal conductor in the second segment.