Phased Array Antenna Aperture Splitting for Multi-Beam Generation
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Solution Overview
Problem
Existing phased array antenna systems face performance degradation when forming multiple beams from a single aperture, leading to reduced gain and increased beamwidth, which can result in regulatory compliance issues and interference problems.
Innovation Solution
The method involves randomly or pseudo-randomly assigning elements to different beams and iteratively selecting phase index locations to minimize phase differences between neighboring elements, allowing for the generation of multiple beams with reduced impact on antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple beams are formed from a single phased array aperture using conventional techniques, then the ability to communicate with or track multiple endpoints simultaneously is improved, but the antenna performance characteristics such as gain and beamwidth are severely degraded
Solution Approach 1:
The phased array aperture is segmented into multiple sub-apertures, where each sub-aperture is responsible for forming one beam toward a different endpoint. This segmentation allows multiple beams to be formed simultaneously while maintaining the performance characteristics of each individual beam, as each sub-aperture operates independently with optimized phase and amplitude distribution.
Solution Approach 2:
Different regions of the phased array aperture are assigned different local qualities or characteristics. Specifically, each sub-aperture within the segmented aperture is optimized independently for its specific beam direction and requirements, allowing each local region to contribute optimally to its designated beam while minimizing interference with other beams.
2Adaptability or versatility
If aperture splitting is performed to form multiple beams, then multi-beam capability is achieved, but main beam characteristics are degraded and sidelobe interference increases
Solution Approach 1:
The harmful sidelobe interference is extracted and separated from the main beam formation process. By independently optimizing each sub-aperture and applying appropriate phase tapering, the sidelobes generated by one sub-aperture do not interfere with the main beams of other sub-apertures, effectively taking out the harmful interference from the overall system performance.
Solution Approach 2:
The potential harmful effect of aperture splitting, which normally creates sidelobe interference, is converted into a benefit through careful design. The segmentation and independent optimization of sub-apertures transforms what would be interference into structured, controlled radiation patterns where sidelobes from different sub-apertures complement rather than interfere with each other's main beams.
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 enables the creation of multiple independent beams with maintained main beam characteristics and increased aperture efficiency, reducing power loss and sidelobe interference, thereby improving overall antenna performance.
Implementation Method 1
the beam pattern produced by the antenna is often dynamically steered and/or modulated by selectively controlling the phase and/or amplitude of signals associated with different antenna elements
Implementation Method 2
In a typical phased array antenna, a plurality of radiating elements is arranged in a two-dimensional array
Data Source
AI summary
Phased array antenna systems and methods for operating phased array antenna systems to efficiently generate multiple beams from a single phased array aperture are disclosed. Elements included in a phased array antenna are randomly assigned to generate one of first or second beams. A phase index for the first set of elements is iterated n times, and a total difference in phase amounts for neighboring elements belonging to different ones of the first and second sets is calculated for each of the n iterations. The phase index resulting in the smallest calculated difference is applied to generate the first beam. The first and second beams are generated from the single phased array aperture simultaneously.