Circular Polarization Array Layout for Odd-Row Axial Ratio Control
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Solution Overview
Problem
In circular polarization array antennas, improving axial ratio characteristics is challenging when the number of rows in the arrangement is odd, as existing techniques are optimized for even-numbered rows and columns, limiting the size and effectiveness of the antenna.
Innovation Solution
The arrangement of radiation elements in a matrix with odd-numbered rows and columns is enhanced by dividing them into two end groups with rotationally symmetric elements, where the center elements of each group are rotated 180 degrees relative to each other, canceling directivity distortion and mimicking a sequential arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of rows in the antenna arrangement is odd, then the device size and adaptability are improved, but the axial ratio characteristics deteriorate
Solution Approach 1:
The antenna array is segmented into multiple groups with different row arrangements. Specifically, some column groups have odd-numbered rows while others have even-numbered rows, allowing the system to adapt to different device sizes while maintaining good axial ratio characteristics through the combination of different segmentation patterns.
Solution Approach 2:
The patent introduces asymmetric arrangements where adjacent column groups have different numbers of rows (odd vs even). This asymmetric design allows the antenna to achieve good circular polarization characteristics while adapting to various device form factors, resolving the contradiction between adaptability and axial ratio performance.
2Device complexity
If the number of rows in the antenna arrangement is odd, then the device complexity is reduced, but the axial ratio characteristics worsen
Solution Approach 1:
By segmenting the antenna into column groups with alternating odd and even row configurations, the design achieves simple implementation while maintaining good axial ratio characteristics. The segmentation pattern itself provides the solution without requiring complex individual element designs.
Solution Approach 2:
Different local regions (column groups) of the antenna have different row configurations (odd or even). This local quality variation allows each segment to contribute differently to the overall radiation pattern, achieving good axial ratio characteristics through the combination of simple local structures.
Data Source
AI summary
An antenna device is formed by arranging a plurality of radiation elements each radiating a circularly polarized wave in a matrix of three rows and ten columns. The plurality of radiation elements include radiation elements of four types having a positional relationship rotationally symmetric with each other. The plurality of radiation elements are included in a first element group in which radiation elements are arranged in a matrix of three rows and three columns in one end portion side and a second element group in which radiation elements are arranged in a matrix of three rows and three columns in the other end portion side. A first center element disposed at a center of the first element group is an element of a type obtained by rotating a second center element disposed at a center of the second element group by 180 degrees.