Vertically Stacked Phased Array Antenna Thermal Management
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Solution Overview
Problem
Existing phased array antennas face challenges in modularity, compactness, heat removal, and reliable interconnect schemes, which affect their performance and maintenance, particularly in AESA systems where power amplifiers and low noise amplifiers are not integrated due to separation for thermal reasons.
Innovation Solution
A vertically stacked array antenna structure with a radiating layer, a passive layer containing RF duplexers, and an active layer with RF amplifiers, where the active layer is thermally coupled with a heat exchanger through a metallic frame for efficient heat removal, and a distribution network for electrical connections, allowing for modular and compact construction with simplified maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power amplifiers are integrated into T/R modules for modular construction, then modularity and compactness are improved, but heat removal becomes difficult and temperature rise occurs
Solution Approach 1:
The patent transitions from planar integration to three-dimensional vertical stacking, placing the active layer with power amplifiers beneath the radiating layer. This vertical arrangement allows heat to be directed downward to dedicated heat exchangers positioned at the base of the structure, effectively separating heat removal pathways from the radiating surfaces and enabling modular construction without thermal compromise.
Solution Approach 2:
The antenna structure is divided into functionally independent layers: a radiating layer for electromagnetic radiation, an intermediate layer for signal distribution, and an active layer for power amplification. Each layer can be independently optimized and maintained, with the active layer specifically designed with thermal management infrastructure, allowing modular replacement of T/R modules without affecting the entire antenna system.
2Device complexity
If a single power amplifier feeds the whole array in ESA, then device complexity is reduced, but power loss increases due to distribution distance
Solution Approach 1:
The patent adopts a three-dimensional vertical stacking architecture where multiple independent power amplifiers are positioned in the active layer directly beneath their corresponding radiating elements in the radiating layer. This vertical proximity eliminates long horizontal distribution paths, enabling each amplifier to feed its associated elements with minimal power loss while maintaining individual channel control and reduced distribution infrastructure.
3Device complexity
If T/R modules are integrated for compact construction, then modularity is improved, but heat generation causes temperature rise and device damage
Solution Approach 1:
The patent extracts the thermal management function from the radiating layer and concentrates it in the active layer beneath. Dedicated heat exchangers are positioned at the base of the structure, thermally coupled to the power amplifiers in the active layer, creating a separate thermal management subsystem that handles heat removal without interfering with the radiating function of the upper layers.
Solution Approach 2:
The patent utilizes the vertical dimension to separate heat-generating components from heat-sensitive radiating elements. Power amplifiers are positioned in the active layer beneath the radiating layer, with heat exchangers positioned at the base. This vertical stratification allows compact horizontal integration while directing heat flow downward through dedicated thermal pathways, preventing temperature rise in the radiating elements.
4Temperature
If RF amplifiers are separated for thermal reasons, then heat removal is improved, but modularity and integration are reduced
Solution Approach 1:
The patent resolves the integration-thermal management conflict by transitioning to three-dimensional vertical stacking. Power amplifiers are positioned in the active layer directly beneath their corresponding radiating elements in the radiating layer, maintaining strong functional integration and minimal signal path lengths. Simultaneously, heat exchangers positioned at the base provide dedicated thermal pathways downward, enabling effective heat removal without sacrificing integration. This vertical arrangement allows T/R modules to remain as integrated functional units while thermal management is handled through the vertical dimension.
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 configuration enhances the modularity and compactness of the antenna, improves heat removal efficiency, and simplifies maintenance by integrating all RF amplifiers in a single layer, reducing signal power losses and increasing reliability.
Implementation Method 1
the active layer is thermally coupled with a heat exchanger through a metallic frame for efficient heat removal
Data Source
Figure 1A
Figure 1B~1C
Figure 1D~1E
AI summary
A vertically stacked array antenna structure is described. The structure comprises a radiating layer, a passive layer disposed under said radiating layer, an active layer disposed under said passive layer, and an interface assembly. The radiating layer comprises an array of radiating elements. The passive layer has only passive components. At least a part of the passive components includes an array of RF duplexers corresponding to the array of radiating elements. The active layer comprises RF amplifiers. The interface assembly comprises at least one metallic frame which is in direct thermal coupling with the RF amplifiers. The interface assembly is configured for providing thermal communication of the active layer with a heat exchanger.