Dual-Mode Antenna Array Beam Steering
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Solution Overview
Problem
The challenge is to develop a compact, efficient, and cost-effective phased array antenna system for communication satellites that can electronically scan antenna beams without the need for complex and expensive active components, while overcoming size and weight limitations imposed by current satellite delivery systems.
Innovation Solution
A dual-mode antenna array system (DAAS) is introduced, featuring an approximately square feed waveguide with first-mode and second-mode directional couplers and radiating elements, allowing for simultaneous transmission and reception of orthogonal signal modes, enabling beam steering without mechanical movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If dynamic phased array antenna systems are used to enable electronic beam scanning, then beam steering capability is improved, but device complexity and cost increase due to specialized active components and control systems
Solution Approach 1:
The patent replaces complex electronic control systems with a passive mechanical-like structure using waveguide mode coupling. Instead of using active phase shifters and power amplifiers to control beam direction, the system uses fixed directional couplers that passively couple different waveguide modes (TE10 and TE01) to achieve beam steering through geometric arrangement rather than active electronic control.
Solution Approach 2:
The patent extracts and removes the complex active components (phase shifters, power amplifiers, control systems) from the phased array system. By using only passive waveguide structures and exploiting mode coupling between TE10 and TE01 modes, the system achieves beam scanning functionality without requiring the extracted active components, thereby simplifying the overall system.
2Device complexity
If fixed phased array antenna systems are used, then device complexity is reduced, but mechanical movement is required for beam steering
Solution Approach 1:
The patent replaces mechanical beam steering with electronic beam scanning using passive waveguide mode coupling. The system uses directional couplers to couple TE10 and TE01 modes, allowing the beam direction to be changed by adjusting the phase and amplitude of the coupled modes without any physical movement of the antenna structure.
Solution Approach 2:
The patent introduces dynamic beam steering capability into an otherwise static fixed array structure. By using variable phase shifters only at the feed points and exploiting the passive coupling between waveguide modes, the system achieves dynamic beam scanning without requiring the entire antenna array to move mechanically.
3Ease of operation
If reflector antenna systems with mechanical scanning are used, then beam steering is achieved, but weight and size increase due to large mechanical mechanisms
Solution Approach 1:
The patent completely eliminates mechanical scanning mechanisms by using passive waveguide mode coupling for beam steering. The system uses fixed directional couplers and waveguide structures that rely on electromagnetic field coupling between TE10 and TE01 modes, replacing all mechanical moving parts with static electromagnetic structures, thereby dramatically reducing weight.
Solution Approach 2:
The patent changes the operating parameters by utilizing dual waveguide modes (TE10 and TE01) simultaneously. By controlling the phase and amplitude relationship between these two modes through passive coupling, the system achieves beam steering through parameter manipulation of the electromagnetic fields rather than through mechanical movement, reducing the physical size and weight of the antenna system.
4Productivity
If communication satellite bandwidth capacity is increased by adding more transponders and antenna elements, then bandwidth capacity is improved, but size and weight limitations are exceeded
Solution Approach 1:
The patent makes the antenna system multi-functional by enabling a single antenna array to perform multiple beam directions and multiple frequency operations simultaneously through passive mode coupling. The same physical antenna structure can serve multiple communication channels and functions without requiring additional antenna elements or transponders, thereby increasing effective bandwidth capacity within the same weight constraints.
Solution Approach 2:
The patent merges the functionality of multiple antenna systems into a single integrated waveguide mode-coupling structure. By combining TE10 and TE01 mode operations in one antenna array, the system achieves the equivalent capability of multiple separate antenna systems without the combined weight and size, allowing increased bandwidth capacity within satellite payload limitations.
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 DAAS achieves efficient and robust beam steering with reduced complexity and cost, enhancing bandwidth capacity while adhering to size and weight constraints, thus addressing the limitations of existing satellite systems.
Implementation Method 1
The ASF waveguide is configured to receive a first-mode input signal and a second-mode input signal at the first-feed waveguide input and a first-mode input signal and a second-mode input signal at the second-feed waveguide input
Implementation Method 2
The plurality of FMDCs are on the first ASF waveguide wall and the plurality of SMDCs are on the second ASF waveguide wall
Data Source
AI summary
Disclosed is a dual-mode antenna array system ("DAAS") for directing and steering an antenna beam that includes an approximately square feed ("ASF") waveguide, a plurality of first-mode directional couplers ("FMDCs"), a plurality of second-mode directional couplers ("SMDCs"), a plurality of first-mode radiating elements ("FMREs"), and a plurality of second-mode radiating elements ("SMREs"). The ASF waveguide includes a first ASF waveguide wall, a second ASF waveguide wall, an ASF waveguide length, a first-feed waveguide input at a first-end of the ASF feed waveguide, and a second-feed waveguide input at a second-end of the ASF feed waveguide. The plurality of FMDCs are on the first ASF waveguide wall and the plurality of SMDCs are on the second ASF waveguide wall. The plurality of FMREs are in signal communication with the plurality of FMDCs and the plurality of SMREs are in signal communication with the plurality of SMDCs.