Monolithic Antenna Array Module via Direct Metal Laser Sintering
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Solution Overview
Problem
Conventional phased-array antennas require additional RF connectors and support structures, increasing complexity and cost, and are not easily scalable to cover wide bandwidths and scan angles with polarization agility.
Innovation Solution
A monolithic phased-array antenna system with integrated coaxial interfaces, baluns, and free-space impedance transformers, fabricated using direct metal laser sintering, eliminating the need for additional RF connectors and support structures, and featuring a tapered transmission line balun and swept ground plane for enhanced bandwidth and mechanical robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional phased-array antennas use additional RF connectors and support structures, then assembly and connection are facilitated, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple separate components (RF connectors, support structures, balun, and radiator elements) into a single monolithic structure fabricated via direct metal laser sintering. This integration eliminates the need for additional RF connectors and support structures, reducing device complexity while maintaining ease of manufacture through additive manufacturing's inherent capability to produce complex geometries in one piece.
Solution Approach 2:
The monolithic structure serves multiple functions simultaneously: it provides mechanical support, electrical connectivity, impedance transformation, and radiation functions. The embedded balun and integrated coaxial interfaces perform multiple electrical functions within the same structural element, reducing the need for separate components and simplifying the overall device architecture.
2Productivity
If conventional phased-array antennas use separate components, then assembly is possible, but assembly time and production cost increase
Solution Approach 1:
By merging all components into a single monolithic structure, the patent eliminates multi-step assembly processes. The direct metal laser sintering process fabricates the entire antenna array module in one continuous operation, dramatically reducing assembly time and increasing productivity compared to conventional methods requiring separate component fabrication and assembly.
Solution Approach 2:
The monolithic structure is fabricated with all features (coaxial interfaces, balun, support structures) pre-integrated during the additive manufacturing process. This preliminary integration of all components before final assembly eliminates the need for subsequent assembly operations, reducing both time and cost.
3Reliability
If conventional antennas require additional RF connectors, then signal connection is achieved, but material cost and assembly complexity increase
Solution Approach 1:
The patent integrates the coaxial interfaces and balun structures directly into the monolithic body, eliminating the need for separate RF connectors. The embedded balun with its integrated coaxial interfaces provides reliable signal connection while reducing the number of discrete components and connection points, thereby simplifying the device structure.
4Adaptability or versatility
If conventional PCB-fabricated antennas are used, then manufacturing is straightforward, but bandwidth coverage and mechanical robustness are limited
Solution Approach 1:
The patent employs a tapered transmission line balun design with optimized geometric parameters to achieve decade-bandwidth coverage (7-21 GHz). The direct metal laser sintering process enables precise control of dimensional parameters, allowing optimization of the tapered structure for ultra-wideband operation while maintaining manufacturability through additive manufacturing.
Solution Approach 2:
The monolithic structure is fabricated from metal powder via direct metal laser sintering, creating a composite-like structure with optimized electromagnetic properties. The additive manufacturing process allows integration of different material properties within the same structure, achieving both wide bandwidth and mechanical robustness that cannot be obtained with conventional PCB materials.
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 solution enables a low-cost, connector-less phased-array antenna module with wideband operation (7-21 GHz) and polarization agility, comparable to conventional PCB-fabricated Vivaldi antennas, with reduced material costs and assembly times, while maintaining high performance and mechanical robustness.
Implementation Method 1
radiating units and a balun of the phased array antenna system may be formed as a monolithic electrically conductive structure... direct metal laser sintering
Implementation Method 2
free-space impedance transformer having first, second and third radiator elements... tapered transmission line balun
Data Source
AI summary
A phased array antenna system having radiating units unitarily formed and arranged in an array by direct metal sintering avoiding assembly requirements. Each radiating unit includes a free-space impedance transformer having first, second and third radiator elements. Each radiating unit includes an embedded balun having first, second, and third impedance transition elements located generally concentric with the first, the second, and the third radiator elements and distally connected respectively to form a first integrated coaxial interface, a second integrated coaxial interface, and an integrated ground interface. Each radiating unit includes a ground plane electrically coupled to the integrated ground interface.