Circular Polarized Antenna Beam Shaping for Axial Ratio Stability
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Solution Overview
Problem
Circular polarized antennas face challenges with axial ratio degradation near the ground plane and detuning effects due to attachment to movable bodies, which affect radiation beam width and circularity.
Innovation Solution
Incorporation of non-overlapping metal strips and tuners with symmetrically oriented extending arms around the antenna to enhance radiation beam width and improve axial ratio, while counteracting detuning effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If circular polarized antenna is used to maintain connection in any direction, then adaptability is improved, but axial ratio degrades near the ground plane
Solution Approach 1:
The antenna system is divided into multiple antenna elements arranged in a specific geometry, with each element contributing to the overall radiation pattern. This segmentation allows independent optimization of each element while achieving the desired omnidirectional coverage and maintaining axial ratio through collective interference patterns.
Solution Approach 2:
The patent introduces vertical spacing and multi-level arrangement of antenna elements to transition from a two-dimensional planar configuration to a three-dimensional spatial arrangement. This dimensional change enables control over the radiation pattern in elevation, maintaining axial ratio near the ground plane while preserving omnidirectional coverage in the horizontal plane.
2Adaptability or versatility
If antenna is attached to movable body, then mobility is improved, but detuning effects occur
Solution Approach 1:
The patent incorporates preliminary tuning adjustments and design considerations to counteract anticipated detuning effects from attachment to movable bodies. By pre-compensating for the expected influence of the mounting structure and environment, the antenna maintains reliable performance across various mobile applications.
Solution Approach 2:
The antenna design allows for adjustment of electrical parameters such as element spacing, length, and feeding characteristics to compensate for detuning effects. By changing these parameters based on the specific mounting conditions and operating environment, the antenna maintains optimal performance despite mobility-related variations.
3Area of stationary object
If radiation beam width is increased, then coverage area is improved, but axial ratio control becomes more difficult
Solution Approach 1:
The patent employs asymmetric arrangement of antenna elements or asymmetric feeding amplitudes and phases to shape the radiation pattern. This asymmetric configuration enables broad coverage area while maintaining controlled axial ratio by creating specific interference patterns that preserve circular polarization characteristics across the expanded coverage region.
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 provides a circular polarized antenna with a wider radiation beam and improved axial ratio, maintaining optimal performance across various orientations and attachments.
Implementation Method 1
a plurality of non-overlapping metal strips disposed around an axis of the circular polarized antenna
Implementation Method 2
An antenna is a device that converts electrical signals into electromagnetic waves and vice versa
Data Source
AI summary
An antenna system comprising a circular polarized antenna a plurality of beam enhancers is provided. The plurality of beam enhancers may include a plurality of non-overlapping metal strips disposed around an axis of the circular polarized antenna, wherein the plurality of non-overlapping metal strips includes at least a first level of metal strips and at least a second level of metal strips, wherein the first level of metal strips is vertically offset from the second level of metal strips, and the first level of metal strips symmetrically arranged around the axis, wherein the first level of metal strips are separated by a second offset.