Cloverleaf Phased Array Antenna Thermal Management
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Solution Overview
Problem
Phased array antennas face challenges in maintaining high effective radiated power, multi-octave bandwidth, wide field-of-view, and polarization agility while efficiently handling peak and average power, especially in adverse temperatures, within the array aperture and corporate feed structure.
Innovation Solution
A phased array antenna design featuring triangular radiating elements arranged in a cloverleaf pattern on a substrate with a fluted core layer for coolant passage and RF center conductors that are orthogonally oriented for efficient signal feeding, allowing for conformal installation and high-power transmission across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high effective radiated power is transmitted, then power transmission capability is improved, but power handling capacity and thermal management become problematic
Solution Approach 1:
The patent implements a coolant distribution system with manifolds and channels that circulate coolant through the array aperture and feed structure. This hydraulic system actively removes heat generated during high power transmission, enabling the antenna to sustain high effective radiated power without thermal damage.
Solution Approach 2:
The patent changes the physical state and flow parameters of coolant to optimize heat removal. By controlling coolant flow rate, temperature, and distribution through the fluted core and manifold system, the system maintains thermal balance during high power operation.
2Adaptability or versatility
If multi-octave bandwidth and wide field-of-view are maintained, then operational versatility is improved, but power handling capability deteriorates
Solution Approach 1:
The patent divides the antenna into multiple independent radiating elements arranged in a cloverleaf pattern. Each element can be independently fed and controlled, allowing the system to maintain wide bandwidth and field-of-view through phased array beamforming while distributing power handling requirements across multiple elements rather than concentrating them in a single structure.
Solution Approach 2:
The patent uses a three-dimensional phased array configuration with elements arranged in multiple layers and orientations (cloverleaf pattern). This spatial distribution in multiple dimensions allows the system to achieve wide field-of-view and multi-octave bandwidth through electronic beam steering while maintaining robust power handling through distributed feeding structures.
3Power
If peak and average power demands are increased, then transmission power is improved, but reliability under adverse conditions deteriorates
Solution Approach 1:
The patent incorporates a pre-designed coolant distribution system with manifolds and channels that proactively removes heat before it can accumulate to damaging levels. The fluted core structure provides additional thermal pathways, creating a cushioning effect that protects the antenna components from thermal stress during high power operation in adverse environmental conditions.
4Ease of manufacture
If conventional feed structures are used, then manufacturing is simplified, but power handling and thermal management become problematic
Solution Approach 1:
The patent employs a composite feed structure combining dielectric materials with embedded coolant channels and metallic RF conductors. The fluted core layer integrates thermal management pathways within the dielectric substrate, creating a multi-functional composite structure that handles high power while maintaining manufacturability through layered construction.
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 design achieves efficient power handling and maintains performance across multi-octave bandwidths and wide field-of-view, with improved power handling and temperature resilience, enabling high peak and average power transmission while maintaining polarization agility.
Implementation Method 1
a fluted core layer is sandwiched between the metallic ground layer and the substrate for channeled passage of coolant
Data Source
AI summary
A phased array antenna includes a substrate, and multiple radiating elements conformally mounted as micro-strip on the substrate. Each of the radiating elements is of a triangular shape, and four of the radiating elements are arranged to form a crossed bowtie cloverleaf radiator. In addition, the four radiating elements form two pairs of radiating elements, and the two pairs of radiating elements are orthogonal to each other. The radiating elements are disposed on a front surface of the substrate, and a RF center conductor is orthogonally oriented toward a rear surface of the substrate and connected to one of the radiating elements for feeding a RF signal to the one radiating element.