Antenna Array Calibration Using Integrated Near-Field Probes
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Solution Overview
Problem
Antenna arrays in wireless and satellite communication systems suffer from linear and non-linear distortions due to manufacturing tolerances, circuit parasitics, and power amplifier non-linearities, which impair their performance and compliance with emission regulations.
Innovation Solution
The use of near-field (NF) probes co-located with the antenna array to receive analog signals, which are then processed to calculate calibration and linearization signals. These signals are used to control the antenna array, thereby compensating for distortions and improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If far-field probing equipment is used for calibration and linearization, then measurement accuracy is improved, but device complexity and in-field deployability deteriorate
Solution Approach 1:
The patent merges the calibration measurement function directly into the antenna array system by integrating near-field probes with the antenna elements. This combination eliminates the need for separate external far-field probing equipment, reducing device complexity while maintaining calibration capability through the integrated probe-array system
Solution Approach 2:
The patent introduces near-field probes as intermediary elements that can be positioned close to the antenna array to capture electromagnetic fields for calibration measurements. These probes serve as a mediator between the antenna array and the calibration system, enabling accurate measurements without requiring complex external far-field equipment
2Measurement precision
If far-field probing equipment is used for calibration and linearization, then measurement accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The patent enables the antenna array system to perform its own calibration and linearization by using integrated near-field probes that are part of the system itself. This self-service capability allows the system to conduct calibration operations independently in field conditions without requiring external measurement equipment or specialized test setups
3Speed
If analog signal processing is used for calibration, then processing speed is improved, but manufacturing precision requirements worsen
Solution Approach 1:
The patent replaces purely analog signal processing with a hybrid approach that incorporates digital signal processing. By converting analog signals from the near-field probes to digital domain, the system achieves fast processing speeds while reducing sensitivity to analog component tolerances and manufacturing variations through digital correction algorithms
Data Source
AI summary
The disclosure is directed a methods and system for calibration and/or linearization of an antenna array. Signals radiated by the antenna array captured by near-field (NF) probes are processed by the system to generate calibration and/or linearization parameters which are then used to control the antenna array.