Lightweight Spiral Antenna Array Packaging Using Foam Core
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Solution Overview
Problem
Traditional packaging methods for antenna arrays using metal cavities are heavy and limited in shape, requiring additional support structures to manage stress and deflection, which complicates the scaling and configuration of antenna arrays.
Innovation Solution
A lightweight packaging method using fiberglass-skinned antenna elements with a flexible RF feed assembly embedded within, where foam layers are bonded and machined to create mounting structures, and metallic elements are bonded to these structures, forming a scalable and modular antenna array that can be cured into a single, inseparable assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal cavities are used for antenna element packaging, then reflective performance is improved, but weight increases significantly
Solution Approach 1:
The patent changes the material parameter from metal to foam, fundamentally altering the weight characteristic while maintaining the cavity's reflective function through the foam's dielectric properties and surface treatment
Solution Approach 2:
The patent uses composite foam structures with multiple layers and materials (including metallic coatings) to achieve both the reflective performance traditionally provided by metal cavities and the weight reduction benefit of foam materials
2Strength
If metal cavities are used for antenna element packaging, then structural support is improved, but device complexity increases due to additional support structures
Solution Approach 1:
The foam structure serves multiple functions simultaneously: it provides the cavity for antenna mounting, offers structural support, enables weight reduction, and facilitates integration with the fiberglass skin, eliminating the need for separate support structures
Solution Approach 2:
The patent merges the cavity structure, support structure, and outer skin into a single integrated foam-based assembly, where the foam blocks themselves provide both the mounting surfaces and the structural framework
3Stability of the object's composition
If traditional packaging methods are used, then assembly stability is improved, but manufacturing time increases due to multiple assembly steps
Solution Approach 1:
The foam blocks are pre-machined with all necessary mounting features, cavities, and integration points before final assembly, allowing multiple components to be prepared in advance and then quickly integrated into the final antenna array structure
Solution Approach 2:
The patent combines multiple traditional assembly steps (mounting elements to support structures, attaching skin, integrating feeds) into a single integrated foam-based structure that is assembled as one unified component rather than separate parts
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 approach results in a significantly lighter antenna array that can be scaled and configured easily, reducing assembly steps and solder joint stresses, while maintaining performance, with the final design being approximately 23% lighter than traditional methods.
Implementation Method 1
autoclaving the multi-antenna array to cure the multi-antenna array into an inseparable antenna assembly
Implementation Method 2
bonding foam as layers to form a foam structure
Data Source
AI summary
The system and method for lightweight spiral antenna array packaging uses a foam core and metallic elements such that the foam core is machined to accept the folded metallic elements to create a compact and light weight assembly. The assembly can be bonded to other assemblies to form arrays. The array is then encapsulated in a prepreg fiberglass skin with a conductive layer of fabric/screen therein.