Two-Phase Thermal Management for Thin Membrane Antennas
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Solution Overview
Problem
Thin membrane type antennas face challenges in thermal management due to significant power dissipation, which affects their operation and increases mass when using metal plates for heat dissipation, making them heavier and less efficient, especially in aerospace applications where weight and cost are critical.
Innovation Solution
A thermal management system is introduced that incorporates spacers between flexible substrates to form heat transfer regions with capillary pumping regions, utilizing a two-phase fluid for efficient heat transfer, reducing weight and enhancing thermal performance by leveraging the phase change of the fluid to manage thermal gradients without significant mass increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If metal plates with high thermal conductivity are used to spread heat in space-based antennas, then thermal management performance is improved, but the mass of the antenna system increases
Solution Approach 1:
The patent employs two-phase heat transfer utilizing phase change of a working fluid between liquid and vapor states. The phase transition occurs in the heat transfer regions where the fluid absorbs heat from electronic components during evaporation and releases heat during condensation, providing efficient thermal management without requiring heavy metal plates. This directly resolves the contradiction by achieving good thermal performance through phase change rather than high-conductivity solid materials.
Solution Approach 2:
The invention uses a two-phase fluid system with capillary pumping regions to circulate the working fluid through the antenna structure. The hydraulic principles of capillary action drive the fluid flow through the porous or structured heat transfer regions, enabling continuous heat removal from electronic components. This fluid-based thermal management system replaces solid metal heat sinks, significantly reducing antenna mass while maintaining effective temperature control.
2Temperature
If traditional thermal management systems are used for thin membrane antennas, then thermal control is achieved, but the weight and cost increase
Solution Approach 1:
The thermal management system is integrated directly into the thin membrane antenna structure itself, rather than being added as a separate external system. The heat transfer regions are formed within the antenna membrane layers, combining the antenna function with thermal management function in a single integrated structure. This integration eliminates the need for additional heavy thermal control components, achieving both thermal control and weight reduction simultaneously.
Solution Approach 2:
The invention maintains the thin membrane structure of the antenna while incorporating thermal management features within the membrane layers. The flexible substrate and thin film structure are preserved, with heat transfer regions and two-phase fluid channels integrated into the membrane architecture. This approach enables effective thermal control without adding significant weight, as the thermal management system uses the existing thin membrane structure rather than adding bulky external components.
3Productivity
If larger active antenna arrays are deployed in space, then antenna capabilities are enhanced, but thermal management becomes more challenging and mass increases
Solution Approach 1:
The thermal management system is divided into multiple discrete heat transfer regions distributed across the antenna array. Each region contains capillary pumping structures and two-phase fluid channels that independently manage heat from local electronic components. This segmented approach allows the system to scale to larger antenna arrays by simply adding more modular heat transfer regions, enabling enhanced antenna capabilities without proportionally increasing overall system mass.
Solution Approach 2:
The two-phase heat transfer system serves multiple functions simultaneously: it cools electronic components, spreads thermal energy across the antenna structure, and can be scaled to accommodate various antenna sizes and configurations. The same basic heat transfer mechanism works for both small and large antenna arrays, providing a universal thermal management solution that enhances antenna capabilities across different scales without requiring fundamentally different approaches or significant mass increases.
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 solution enables effective thermal management with minimal weight penalty, allowing for larger, lighter active antenna arrays in space applications, reducing thermal gradients and peak device temperatures, and enhancing the operational capabilities of space-based antennas.
Implementation Method 1
two-phase heat transfer is integrated directly into an antenna membrane to facilitate a low-cost thermal management system
Implementation Method 2
Liquid to vapor phase change has the ability to transfer thermal energy with a very small temperature penalty
Implementation Method 3
a plurality of spacers disposed between a first flexible substrate and a second flexible substrate to form a plurality of heat transfer regions each having a plurality of capillary pumping regions
Data Source
AI summary
According to an embodiment of the present invention, a thermal management system for electronic components includes a plurality of spacers disposed between a first flexible substrate and a second flexible substrate to form a plurality of heat transfer regions each having a plurality of capillary pumping regions, a two-phase fluid disposed between at least one pair of adjacent spacers, and a plurality of electronic components coupled to a mounting surface of the first flexible substrate.