OAM Feed Beam Illumination for Reflective Antenna
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Solution Overview
Problem
Current OAM antenna systems face limitations in efficiently combining multiple OAM beams with different modes and polarizations for high-data-rate transmissions, as they often require complex shapes and discontinuities to impart non-zero OAM, which can be impractical for standard reflective antennas.
Innovation Solution
An antenna system utilizing a non-OAM primary reflective antenna illuminated with OAM feed beams, where each feed beam has a specific mode and polarization, allowing for the reflection and combination of multiple OAM beams without altering their OAM properties, enabling efficient transmission of composite OAM beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reflective antenna with complex shapes and discontinuities is used to impart non-zero OAM to EM signals, then the OAM property of the transmitted beam is improved, but the device complexity and manufacturing difficulty increase significantly
Solution Approach 1:
The patent extracts the OAM-imparting function from the reflective antenna and relocates it to a separate feed component. The feed contains an OAM-imparting element (such as a spiral or twisted structure) that generates the non-zero OAM, while the reflective antenna itself remains a simple paraboloid without any discontinuities or complex shaping.
Solution Approach 2:
The patent introduces an intermediary feed component as a mediator between the signal source and the reflective antenna. This feed contains the OAM-imparting mechanism and illuminates the simple reflective surface, allowing the complex OAM-generation function to be separated from the simple reflection function.
2Productivity
If multiple OAM beams with different modes are combined for high-data-rate transmission, then the productivity and data rate are improved, but the device complexity increases due to the need for complex antenna shapes
Solution Approach 1:
The patent segments the OAM beam generation function into separate feed components, each capable of generating a specific OAM mode. Multiple feeds with different OAM modes can be independently designed and combined, allowing for easy multiplication of modes without increasing the complexity of the reflective antenna itself.
Solution Approach 2:
The patent creates a universal reflective antenna design that can work with any number of OAM modes. The simple paraboloid shape serves multiple functions: reflecting all OAM modes equally and allowing flexible combination of different mode feeds without requiring mode-specific antenna modifications.
3Ease of manufacture
If standard reflective antennas are used without OAM-imparting features, then the ease of manufacture is improved, but the ability to transmit OAM beams is lost
Solution Approach 1:
The patent extracts the OAM-imparting function from the antenna structure and places it in the feed component. This allows the antenna to be manufactured as a simple standard reflective surface while the OAM capability is provided by the separately manufactured feed assembly.
Solution Approach 2:
The feed acts as an intermediary that provides the OAM transmission capability to the standard reflective antenna. The feed contains the complex OAM-generating structure, while the antenna remains simple and easy to manufacture, yet the combined system achieves full OAM transmission functionality.
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
This approach allows for the efficient transmission of multiple OAM beams with different modes and polarizations, enhancing data rate capabilities while maintaining the integrity of the OAM properties, and simplifying the antenna design by using standard reflective surfaces.
Implementation Method 1
reflecting from the reflective antenna the first OAM feed beam
Data Source
AI summary
Electromagnetic (EM) feeds can illuminate a standard primary reflective antenna with a plurality of feed beams each having a different orbital angular momentum (OAM) or polarization. The reflective antenna, which can be a non-OAM antenna, can reflect the feed beams and thereby produce a composite OAM transmission comprising each of the feed beams. A non-OAM primary antenna can thus transmit a plurality of OAM feed beams as a composite OAM transmission.