Stacked Conductive Mesh Reflector for High-Frequency RF Applications
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Solution Overview
Problem
Conventional mesh materials are not suitable for frequencies above 30 GHz due to diminishing reflectivity and undesirable characteristics, and increasing the number of openings per inch to improve performance is expensive and challenging.
Innovation Solution
A reflector formed by stacking two or more conductive knit web layers with fastening members to secure them, allowing for a highly conductive and flexible surface that maintains reflectivity at higher frequencies with reduced signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mesh materials are used, then the structure is simple and cost-effective, but reflectivity diminishes at frequencies above 30 GHz
Solution Approach 1:
The mesh material is segmented into multiple layers (first web layer and second web layer) with different opening patterns. Each layer handles specific frequency ranges, with the first layer optimized for lower frequencies and the second layer for higher frequencies. This segmentation allows the overall structure to maintain high reflectivity across a broad frequency spectrum from DC to above 30 GHz, resolving the limitation of conventional single-layer mesh materials.
Solution Approach 2:
The patent combines multiple mesh layers with different geometric characteristics into a composite structure. The first web layer and second web layer are positioned at different orientations (e.g., 0 degrees and 45 degrees) to create a composite material that exhibits superior electromagnetic properties across wide frequency ranges, maintaining reflectivity where conventional single-material mesh fails.
2Reliability
If the number of openings per inch is increased to improve high-frequency performance, then reflectivity at higher frequencies improves, but manufacturing cost and complexity increase significantly
Solution Approach 1:
Instead of manufacturing a single expensive high-OPI mesh, the patent segments the function across multiple lower-OPI layers. The first web layer can use 10-18 OPI mesh for lower frequencies, while the second web layer uses similar or slightly finer mesh for higher frequencies. This segmentation makes manufacturing more feasible and cost-effective compared to producing a single ultra-fine mesh that would be required to handle all frequencies independently.
Solution Approach 2:
The patent adds the dimensional aspect of layer stacking to solve the frequency coverage problem. Rather than increasing OPI in a single plane (which increases cost exponentially), the solution moves to multiple planes/layers, where each layer contributes to different frequency ranges. This dimensional approach allows moderate OPI values (10-18 OPI) to achieve what would require extremely high OPI in a single layer.
3Reliability
If conventional single-layer mesh is used, then manufacturing is straightforward, but signal loss increases at frequencies above 30 GHz
Solution Approach 1:
The signal transmission function is segmented across multiple layers. The first web layer handles signal transmission for lower frequencies with minimal loss, while the second web layer specifically addresses higher frequency transmission. This segmentation ensures that each layer operates within its optimal frequency range, minimizing overall signal loss from DC to above 30 GHz compared to a single-layer design where all frequencies must pass through the same mesh structure.
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 stacked mesh reflector achieves improved reflectivity with less than 0.2 dB loss up to 50 GHz, offering a lightweight and cost-effective solution for high-frequency applications while minimizing passive intermodulation.
Implementation Method 1
The reflector includes a first web layer formed from a knit of at least a first conductive filament, and a second web layer formed from a knit of at least a second conductive filament... The stacked mesh reflector achieves improved reflectivity with less than 0.2 dB loss up to 50 GHz
Data Source
AI summary
The invention concerns a reflector (8) of radio frequency (RF) energy. The reflector includes a first web layer (9a) formed from a knit of at least a first conductive filament (11a), and a second web layer (9b) formed of a knit of at least a second conductive filament (11b). The first and second web layers can be formed as an open mesh 10. The second web layer is positioned on the first web layer to form a stack. Fastening members (14, 16) are disposed at intervals across a surface of each of the first and second web layers. The fastening members are advantageously configured to secure the first web layer to the second web layer. The invention also concerns a reflector antenna formed using the reflector of radio frequency energy. The reflector antenna includes antenna support elements (18), and the first and second web layers are secured to the antenna support structure to define a curved three dimensional surface.