Hierarchical Phased-Array Antenna Modules Serial Bus Beam Steering
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Solution Overview
Problem
Conventional phased-array antennas face challenges in quickly updating phase shifts for high mobility applications due to inefficient dissemination of phase shift control information, particularly with a large number of antenna elements and the need for simplified digital interconnection to reduce cost and space.
Innovation Solution
A system utilizing a serial bus to efficiently disseminate phase shift control information to phase shifters, where a processor generates operands and commands that are transmitted over a serial bus to PhAT circuits, minimizing the distribution of phase control information and reducing bus speed and cost, with each submodule determining its own base phase shift weight and applying phase increments to direct the antenna beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If parallel data buses are deployed to quickly update phase shifts for high mobility applications, then beam steering speed is improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the antenna array into multiple subarrays, each controlled by a dedicated phase shifter module. This segmentation allows independent control of smaller groups of elements, reducing the complexity of controlling the entire array while maintaining fast beam steering capability through parallel operation of subarray controllers.
Solution Approach 2:
The patent introduces a hierarchical control structure with multiple levels: a central controller that manages overall beam direction and local controllers that handle fine-grained phase adjustments for each subarray. This dimensional organization of control functions reduces the complexity of direct parallel control while achieving high-speed beam steering through coordinated operation across control levels.
2Manufacturing precision
If parallel data buses are used to control a large number of phase shifters, then phase control precision is improved, but manufacturing cost and space requirements increase
Solution Approach 1:
The patent merges multiple control functions into integrated phase shifter modules that combine phase adjustment, amplitude control, and local signal processing capabilities. This integration reduces the number of separate components and interconnections needed, lowering manufacturing cost and space requirements while maintaining precise phase control through the combined functionality of each module.
Solution Approach 2:
Each phase shifter module incorporates local control logic and memory that enables it to autonomously maintain precise phase settings without requiring continuous external control signals. This self-service capability reduces the bandwidth and complexity of external control buses while preserving phase control precision through local feedback and adjustment mechanisms.
Data Source
AI summary
A host processor controls an apparatus by updating all the phase shifter values of a phased array antenna by using “global write” to update these parameters to all phased-array transformation circuits simultaneously via a serial bus. Antenna elements, each controlled by a phased-array transformation circuit, are individually configured to transform phase and gain according to a register array. The register array has a local register group and a central register group, the local registers physically placed close in proximity to RF chains which each correspond to an element of array antenna, whereby each set of local registers control an individual antenna element and a central register controlling overall beam steering function. The apparatus is transformed by the host efficiently elaborating phase shift weights into a submodule of a phase array antenna system with low noise and bandwidth. The host triggers reuse of phase and gain when it can.