Switchable Feed Elements with Focus Lens for Satellite Beam Steering
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Solution Overview
Problem
Non-geosynchronous satellite communication systems, such as those using low-earth orbits, face challenges in maintaining communication links due to satellites' dynamic positions relative to user terminals, requiring fast and efficient beam steering capabilities that are not adequately met by existing mechanical or phased-array antenna solutions, which are either slow or costly.
Innovation Solution
A user terminal equipped with an antenna feed structure having switchable feed elements and a focus lens, allowing for the formation of an initial beam that can be selectively switched and focused to achieve rapid beam steering over a wide range of angles, eliminating the need for expensive RF components typically required in phased-array systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If mechanically steered dish or lens antennas are used, then beam steering capability is achieved, but the scanning speed is much slower than electronic beam scanning
Solution Approach 1:
The patent replaces the mechanical steering mechanism with an electronic switching system. Instead of physically moving the antenna beam using motors and mechanical components, the system uses electronic switches to rapidly activate different feed elements, achieving beam steering at electronic speeds without mechanical complexity.
Solution Approach 2:
The patent creates a dynamic beam steering system where the beam direction can be rapidly changed by switching between different feed elements. This dynamic electronic switching allows the beam to track moving satellites in non-geosynchronous orbits, providing both speed and adaptability without mechanical movement.
2Speed
If electronically steerable phased-array antennas are used, then fast beam scanning is achieved, but the cost is significantly higher than mechanically steered antennas
Solution Approach 1:
The patent uses a simplified electronic switching architecture with individual feed elements that can be independently activated. This approach replaces expensive phased-array components with simpler, more cost-effective switching circuitry and feed elements, achieving fast beam scanning at a fraction of the cost of traditional phased-array systems.
Solution Approach 2:
The patent divides the antenna into multiple discrete feed elements that can be independently controlled through electronic switching. This segmentation allows the system to achieve electronic beam steering by activating different combinations of feed elements, providing fast scanning capability without the complex and expensive infrastructure of a full phased-array system.
3Adaptability or versatility
If phased-array antennas steer beam to large off-boresight angles, then wide coverage is achieved, but the effective aperture size increases resulting in wider beam width and lower antenna gain
Solution Approach 1:
The patent positions multiple feed elements at different locations and orientations around the reflector. Each feed element is optimized for specific angular regions, allowing the system to maintain high gain across a wide field of view by selecting the appropriate feed element for each satellite position, rather than relying on a single boresight-optimized element.
Solution Approach 2:
The patent arranges feed elements in three-dimensional space around the reflector, utilizing multiple spatial dimensions and orientations. This spatial distribution of feed elements enables the system to maintain consistent beam characteristics and high gain across wide angular ranges by selecting feed elements optimally positioned for each viewing angle.
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 solution enables fast, reliable, and cost-effective beam steering, maintaining communication links with satellites in non-geosynchronous orbits without the need for expensive phased-array antenna components, ensuring continuous service and high antenna gain across a wide field-of-view.
Implementation Method 1
a focus lens positioned adjacent to the antenna feed structure to form a focused beam based on the initial beam
Data Source
AI summary
A beam steering antenna is provided in a user terminal for satellite communications. The beam steering antenna includes an antenna feed structure having a plurality of feed elements configured to be switched on or off to form an initial beam, and a focus lens positioned adjacent to the antenna feed structure to form a focused beam. The antenna feed structure may include a plurality of active waveguide feed elements to generate a circularly polarized initial beam. The focus lens may be a spherical lens to form a circularly polarized focused beam.