Patch Antenna Ground Cutout Layout for Axial Ratio Stability
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Solution Overview
Problem
The axial ratio of patch antennas can deteriorate depending on the shape of the ground portion where they are disposed, affecting their performance.
Innovation Solution
An antenna device with a patch antenna disposed on a ground portion having a cutout portion in a rectangular shape, which overlaps with the patch antenna, improving the axial ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rectangular ground portion is used for the patch antenna, then the structure is simple and easy to manufacture, but the axial ratio deteriorates
Solution Approach 1:
The ground portion is designed with an asymmetric cutout portion formed in one corner of the rectangle, creating an asymmetric shape that improves the axial ratio of the patch antenna while maintaining manufacturing simplicity
Solution Approach 2:
Instead of changing the entire ground portion shape, only a local cutout is made at one corner, providing the necessary asymmetry to improve axial ratio while minimizing structural complexity and maintaining ease of manufacture
2Reliability
If the ground portion shape is modified to improve axial ratio, then the axial ratio improves, but the structure becomes more complex
Solution Approach 1:
A simple cutout portion is made at one corner of the rectangular ground portion, providing local asymmetry to improve axial ratio without significantly increasing overall structural complexity
Solution Approach 2:
The ground portion is segmented by creating a cutout, dividing the originally simple rectangle into a slightly more complex shape that provides the necessary asymmetry for improved axial ratio performance
Data Source
AI summary
An antenna device includes: a patch antenna; and a ground portion at which the patch antenna is disposed, the ground portion having an external form obtained by forming a cutout portion in a rectangle, the cutout portion overlapping with at least a part of the patch antenna, in side view. Further, a first center of the patch antenna is shifted toward a long side of the rectangle having the cutout portion formed therein, relative to a second center of the rectangle.