Aperture Segmentation for Cylindrical Feed Antennas
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Solution Overview
Problem
The fabrication of large antennas is challenging due to size limitations and high fabrication costs, and existing technologies like active matrix technologies are not feasible for cylindrical feed antennas, as they require complex conductor arrangements that are difficult to implement in non-linear antenna element configurations.
Innovation Solution
A flat panel antenna system with matrix drive circuitry that addresses and drives liquid crystal-based antenna elements arranged in concentric rings, using a cylindrical wave feed architecture and metamaterial technology to form and steer beams, allowing for segmentation into quadrants while maintaining RF performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If active matrix technologies with rows and columns of conductors are used to drive antenna elements, then each antenna element can be uniquely addressed and controlled, but the technology is not feasible when antenna elements are arranged in non-row-column configurations such as concentric rings
Solution Approach 1:
The antenna aperture is divided into multiple segments arranged in concentric rings around the feed antenna. Each ring contains multiple antenna elements that can be independently controlled. This segmentation allows the system to maintain unique addressing capability while adapting to circular geometries that are incompatible with traditional row-column matrix arrangements.
Solution Approach 2:
The patent transitions from the traditional two-dimensional row-column matrix arrangement to a radial concentric ring arrangement around a central feed. This dimensional reconfiguration allows antenna elements to be positioned in circles at different radii from the feed, enabling unique addressing through radial and angular coordinates rather than row and column indices.
2Ease of manufacture
If large antenna arrays are segmented into identical Line Replaceable Units (LRUs), then fabrication complexity and costs are reduced, but no tiling approach has been found for cylindrical feed antennas
Solution Approach 1:
The antenna aperture is divided into multiple identical or near-identical segments arranged in concentric rings. Each segment contains antenna elements that can be fabricated using standardized processes and then assembled around the cylindrical feed. This segmentation enables modular fabrication and assembly while maintaining compatibility with cylindrical feed geometries.
Solution Approach 2:
The patent creates a universal tiling approach that can be applied to cylindrical feed antennas by arranging identical antenna element segments in concentric rings. This universal method can be adapted to different feed types and frequencies while maintaining the benefits of modular fabrication and assembly.
3Reliability
If antenna elements are placed densely to improve RF performance and beam steering capabilities, then fabrication precision requirements increase due to the complexity of addressing non-linear configurations
Solution Approach 1:
The antenna aperture is divided into segments arranged in concentric rings with standardized spacing. This segmentation provides a regular geometric framework that simplifies placement precision requirements compared to arbitrary non-linear configurations. Each ring maintains consistent radial spacing from the feed, enabling systematic fabrication and assembly processes.
Solution Approach 2:
The patent employs systematic parameter variations in the concentric ring design, such as controlled radial spacing and angular positioning of elements within each ring. These parameter changes create a regular pattern that balances high element density for improved RF performance with manufacturable precision tolerances.
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
Enables efficient and cost-effective fabrication of large antennas with improved RF performance and beam steering capabilities, overcoming the limitations of traditional antenna fabrication methods and achieving high-density, uniform cell placement and segmentation.
Implementation Method 1
each of the antenna elements that are not placed in rows and columns. In one embodiment, the elements are placed in rings
Implementation Method 2
a cylindrical wave feed architecture and metamaterial technology to form and steer beams
Implementation Method 3
a cylindrical wave feed architecture and metamaterial technology to form and steer beams
Data Source
Figure 1A~1B
Figure 2
Figure 3~4
AI summary
A method and apparatus for aperture segmentation are disclosed. In one embodiment, the antenna comprises an antenna feed to input a cylindrical feed wave and a physical antenna aperture coupled to the antenna feed and comprising a plurality of segments having antenna elements that form a plurality of closed concentric rings of antenna elements when combined, where the plurality of concentric rings are concentric with respect to the antenna feed.