Beamforming Antenna Self-Calibration for Phase and Amplitude Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Phased array antenna systems suffer from performance impairments due to variations in amplitude and phase among antenna elements caused by factors such as trace length differences, manufacturing variations, and component tolerances, leading to suboptimal coverage.
Innovation Solution
A controller in the antenna system cycles through phase-shifter states to measure and record amplitudes and phases of individual and paired antenna elements, determining and correcting phase and amplitude errors to align RF signals, thereby calibrating the phase shifters to optimize beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration methods using costly test equipment are employed, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent uses a simplified measurement approach where the antenna elements themselves serve as measurement probes. Each antenna element measures the signal from other elements, creating a self-measuring system that eliminates the need for external test equipment while maintaining calibration accuracy
Solution Approach 2:
The antenna array performs self-calibration by having each element measure signals transmitted by other elements in the array. This self-service approach allows the system to calibrate itself without external intervention or expensive test equipment, reducing system complexity while achieving precise amplitude and phase alignment
2Manufacturing precision
If manual calibration procedures are used, then manufacturing precision can be achieved, but productivity decreases
Solution Approach 1:
The system implements automated feedback-based calibration where measurement results from antenna elements are immediately used to adjust phase shifter settings. The controller processes measurements and automatically modifies phase shifter states to minimize amplitude and phase errors, enabling rapid iterative optimization without manual intervention
Solution Approach 2:
The patent performs preliminary measurements of amplitude and phase characteristics for all antenna elements before final calibration. This preliminary characterization data is stored and used to guide the calibration process, allowing the system to pre-calculate optimal phase shifter settings and accelerate the overall calibration procedure
3Reliability
If phase and amplitude alignment is not optimized, then device complexity remains low, but beamforming performance deteriorates
Solution Approach 1:
The system dynamically adjusts phase shifter settings based on real-time measurements and environmental conditions. The calibration process is iterative and adaptive, allowing the beamforming system to optimize performance continuously rather than relying on fixed static settings, thereby improving reliability while managing complexity through algorithmic control
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.