Liquid Cooling Conduit Waveguide for Multi-Chip Data Links

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Solution Overview

Problem

Current data transmission methods in multi-chip package structures face challenges with signal attenuation and frequency dispersion when transmitting high-frequency signals, and existing cooling systems occupy valuable space within server systems.

Innovation Solution

Integration of a liquid cooling conduit that serves as a waveguide for high-speed data transmission between IC chips, utilizing monopole feeds and mesh signal reflectors to maintain signal propagation while circulating coolant, thereby combining heat dissipation and data transmission functions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If planar transmission lines are used for data transmission, then data can be transmitted between package components, but signal attenuation and frequency dispersion occur at high frequencies

Engineering Contradiction:
Improvedata transmission speedVSAvoidsignal quality
Core Design Contradiction:
SpeedVSReliability

Solution Approach 1:

The patent combines the cooling system and data transmission system into a single integrated structure. The liquid cooling conduit serves dual purposes: removing heat from IC chips and transmitting electromagnetic signals for high-speed data communication. This merging eliminates the need for separate transmission lines, reducing signal attenuation and frequency dispersion while maintaining effective cooling.

Inventive Principle:
Principle #5Merging (Combining)

2Temperature

If separate cooling systems are implemented, then heat dissipation is effective, but valuable space within server systems is occupied

Engineering Contradiction:
Improveheat dissipation efficiencyVSAvoidspace consumption
Core Design Contradiction:
TemperatureVSVolume of moving object

Solution Approach 1:

The liquid cooling conduit is designed to perform multiple functions simultaneously. It serves as both a thermal management component for heat dissipation and as a waveguide for electromagnetic signal transmission. This multi-functionality reduces the overall space required in the server system by eliminating redundant components.

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Productivity

If conventional transmission lines are used, then data transmission is possible, but space efficiency is reduced due to separate cooling infrastructure

Engineering Contradiction:
Improvedata transmission bandwidthVSAvoidspace utilization
Core Design Contradiction:
ProductivityVSArea of stationary object

Solution Approach 1:

The invention merges the cooling infrastructure with the data transmission infrastructure into a single integrated conduit system. The liquid cooling pipe serves as the transmission medium for electromagnetic signals, eliminating the need for separate planar transmission lines and reducing overall space requirements while maintaining high bandwidth capability.

Inventive Principle:
Principle #5Merging (Combining)

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 liquid cooling conduit effectively transmits high-speed data and dissipates heat, minimizing space consumption and improving data transmission speeds up to hundreds of Gbps, suitable for millimeter-wave to terahertz frequencies.

Implementation Method 1

a fluid conduit thermally coupled to the first IC chip and the second IC chip. The multi-chip package structure is configured to remove heat generated by at least one of the first IC chip and the second IC chip

Methodology Applied
Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

Air and liquid cooling techniques have been applied to cool servers that have high-power devices such as CPUs and graphics processing units (GPUs)

Methodology Applied
Scientific EffectConvection: Convection

Implementation Method 3

The first monopole feed is configured to transmit an electromagnetic signal through the fluid conduit

Methodology Applied
Scientific EffectElectromagnetic wave propagation: Electromagnetic Induction

Implementation Method 4

Integration of a liquid cooling conduit that serves as a waveguide for high-speed data transmission between IC chips

Methodology Applied
Scientific EffectWaveguide: Waveguide

Data Source

PatentUS12451448B2Electromagnetic waveguiding through liquid cooling conduit
Publication Date: 2025.10.21 INTERNATIONAL BUSINESS MACHINE CORPORATION
  • US12451448B2 patent drawing
  • US12451448B2 patent drawing
  • US12451448B2 patent drawing

AI summary

A multi-chip package structure is provided. The multi-chip package structure includes a first IC chip and a second IC chip, and a fluid conduit thermally coupled to the first IC chip and the second IC chip. The multi-chip package structure is configured to remove heat generated by at least one of the first IC chip and the second IC chip. The fluid conduit has a first end and a second end opposite to the first end. The multi-chip package structure also includes a first monopole feed connected between the first IC chip and the first end of the fluid conduit, and a second monopole feed connected between the second IC chip and the second end of the fluid conduit. The first monopole feed is configured to transmit an electromagnetic signal through the fluid conduit toward the second monopole feed and vice versa.