Beamforming Antenna Calibration for Phase and Amplitude Errors
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Solution Overview
Problem
Phased array antenna systems face performance and coverage issues due to variations in amplitude and phase among antenna elements caused by factors such as trace length differences, manufacturing variations, and component tolerances, which existing calibration methods fail to adequately address.
Innovation Solution
A controller in the phased array antenna system cycles through all phase-shifter states, records amplitude measurements, and activates antenna elements individually and in pairs to determine and correct amplitude and phase errors, aligning phases and amplitudes to optimize beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional calibration methods are used, then manufacturing simplicity is maintained, but beamforming performance and coverage are degraded due to amplitude and phase errors
Solution Approach 1:
The calibration process is segmented into distinct phases: individual element calibration and pair-wise element calibration. This segmentation allows systematic correction of amplitude and phase errors by isolating and addressing specific error sources in a structured sequence, improving beamforming performance without overwhelming system complexity
Solution Approach 2:
The system implements feedback mechanisms where amplitude measurements are taken during calibration, errors are calculated based on these measurements, and phase shifter settings are adjusted accordingly. This closed-loop feedback approach enables automatic correction of manufacturing variations and trace length differences, resolving the contradiction between performance and complexity
2Stability of the object's composition
If phase shifter settings are adjusted to compensate for trace length differences, then signal alignment is improved, but measurement precision requirements increase
Solution Approach 1:
The calibration process performs preliminary measurements of amplitude for each antenna element and pair of elements before final phase shifter configuration. These preliminary actions establish baseline data that guides subsequent phase adjustment, reducing the precision burden on final measurements while achieving stable signal alignment
Solution Approach 2:
The system changes phase shifter parameters based on measured amplitude variations caused by trace length differences. By dynamically adjusting phase parameters according to measured data, the system compensates for manufacturing variations and achieves signal alignment without requiring ultra-precise measurement equipment
3Measurement precision
If all antenna elements are calibrated individually and in pairs, then calibration accuracy is improved, but calibration time increases
Solution Approach 1:
The calibration is segmented into efficient individual and pair-wise stages, where each stage addresses specific error components. This segmentation enables systematic correction without requiring exhaustive multi-element measurements, balancing accuracy with time efficiency
Solution Approach 2:
The system performs calibration on pairs of elements rather than all possible combinations, representing a partial action approach. This selective pairing provides sufficient calibration accuracy for beamforming applications while significantly reducing the time and measurement burden compared to exhaustive calibration methods
Data Source
AI summary
An antenna system comprising (1) an array of antennas capable of beamforming and (2) at least one controller communicatively to the array of antennas, wherein the controller (A) collects a first set of measurements taken at each of the antennas as the antennas are activated individually, (B) collects a second set of measurements taken at each of the antennas as pairs of the antennas are activated together, (C) determines one or more inefficiencies in the beamforming of the antennas based at least in part on the first and second sets of measurements, and (D) calibrates the antennas to improve the beamforming by modifying one or more phase shifters of the antennas to compensate for the inefficiencies in the beamforming. Various other apparatuses, systems, and methods are also disclosed.