Foam Layer Transmission Line for Lightweight Antennas
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Solution Overview
Problem
Conventional antenna array and transmission line technologies pose significant weight and other challenges for very low mass or ultra-lightweight antenna designs, particularly in space applications such as micro-satellite radar systems.
Innovation Solution
A transmission line structure comprising a conductor trace sandwiched between dielectric foam layers, with ground plane layers and mode suppression metallic elements, utilizing lightweight materials like ROHACELL foam and copper-clad LCP for reduced weight and RF loss, and employing stitching or plating techniques for trace isolation and mode suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional antenna array and transmission line technology is used, then antenna performance can be maintained, but weight becomes excessive for ultra-lightweight applications
Solution Approach 1:
The patent employs foam core structures with porous or cellular interiors to dramatically reduce antenna weight while preserving structural integrity and electromagnetic performance. The foam cores replace solid dielectric materials, providing weight reduction without compromising the antenna's functional properties.
Solution Approach 2:
The antenna utilizes composite construction combining foam cores with metallic cladding layers and conductive traces. This composite approach allows the structure to achieve both lightweight characteristics from the foam and structural/electromagnetic performance from the metallic components, resolving the contradiction between weight and performance.
2Weight of moving object
If lightweight materials are used to reduce weight, then RF losses increase
Solution Approach 1:
The transmission line employs a composite structure with foam core and metallic cladding layers. The metallic cladding provides conductive pathways that minimize RF losses, while the foam core maintains the lightweight advantage. This composite design prevents the typical trade-off between weight reduction and RF loss increase.
Solution Approach 2:
Different regions of the transmission line structure have optimized properties: the foam core provides lightweight mechanical support, while the metallic cladding layers and conductive traces provide low-loss electromagnetic conduction paths. Each local region is optimized for its specific function, achieving both weight reduction and low RF loss.
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 the creation of lightweight, efficient antenna structures that maintain performance across various frequency bands, from S-band to Ka-band, while minimizing weight and RF losses, thus addressing the weight and efficiency challenges of conventional technologies.
Implementation Method 1
a first dielectric foam layer and a second dielectric foam layer. The conductor trace is sandwiched between the first foam layer and the second foam layer
Implementation Method 2
A plurality of mode suppression metallic element portions pass through the first ground plane layer, the first foam layer, the second foam layer and the second ground plane layer in a generally transverse arrangement
Data Source
AI summary
A transmission line structure for propagating electromagnetic energy includes a transmission line conductor trace, a first dielectric foam layer and a second dielectric foam layer. The conductor trace is sandwiched between the first foam layer and the second foam layer. A first ground plane layer and a second ground plane layer sandwich the first foam layer, the conductor pattern and the second foam layer.