Antenna Array Calibration Using Electromagnetic Field Probes
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Solution Overview
Problem
Modern wireless communication devices face challenges in accurately calibrating antenna arrays due to small positional deviations affecting beamforming quality, especially at millimeter wave frequencies, where deviations of 0.2 mm can result in 20% or more signal strength variation, and optical determination is hindered by protective covers or layers.
Innovation Solution
A calibration system that generates a test signal to drive antenna elements to emit or receive electromagnetic signals, which are measured by probes to determine the precise positions of the antenna elements using a position determination unit, allowing for relative positioning and calibration, and includes a motion actuator for detailed measurements and a correction factor calculator to equalize signal path outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If optical methods are used to determine antenna element positions, then measurement speed is improved, but measurement precision deteriorates due to protective covers or layers blocking the optical path
Solution Approach 1:
The patent introduces an electromagnetic field as an intermediary medium to transfer information about antenna element positions. Instead of using optical methods that are blocked by protective covers, the system uses electromagnetic signals that can penetrate or interact with the protective layers, allowing the probes to detect position information through the covers without direct optical contact.
Solution Approach 2:
The patent replaces the optical measurement system with an electromagnetic-based measurement system. Instead of using light to detect positions, the system uses electromagnetic signals generated by the antenna elements and detected by probes, substituting the optical domain with the electromagnetic domain to overcome the blocking effect of protective covers.
2Reliability
If small positional deviations of antenna elements are measured, then beamforming quality is improved, but measurement precision requirements increase significantly
Solution Approach 1:
The patent implements a feedback mechanism where the probes measure the electromagnetic signals emitted by antenna elements, and these measurements are used to calculate and determine the precise positions of the antenna elements. The system continuously refines position information based on the measured signal characteristics, allowing for accurate position determination even for small deviations that affect beamforming quality.
Solution Approach 2:
The patent performs preliminary measurements of the electromagnetic field distribution before final position calculation. By first measuring the raw electromagnetic signals from multiple probes and then processing this data to determine positions, the system prepares the measurement data in advance, enabling accurate detection of small positional deviations that would otherwise be difficult to measure.
3Ease of operation
If electromagnetic signals are used instead of optical methods, then ease of operation is improved by penetrating protective covers, but device complexity increases due to additional signal generation and measurement equipment
Solution Approach 1:
The patent makes the antenna elements serve multiple functions: they are both the active components for wireless communication and the signal sources for position measurement. By utilizing the existing antenna elements to emit electromagnetic signals for calibration purposes, the system avoids adding separate signal generation equipment, thereby reducing overall device complexity while maintaining ease of operation.
Solution Approach 2:
The antenna elements serve themselves by emitting electromagnetic signals that are used for their own position measurement and calibration. Instead of requiring external equipment to generate test signals and measure positions, the system uses the antenna elements' own operational signals, allowing the device to perform self-calibration without additional complex external equipment.
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 system ensures accurate calibration of antenna arrays and RF devices, improving signal quality and beamforming capabilities by determining precise antenna element positions and balancing signal path tolerances, thereby enhancing communication efficiency and compliance with regulatory standards.
Implementation Method 1
a test signal 7, 27 to the antenna elements 2, 3, which drives the antenna elements to emit an electromagnetic signal
Data Source
AI summary
A calibration system for calibrating an antenna array comprising a plurality of antenna elements comprises a signal generator for generating a predetermined test signal and, the signal generator being couplable to the antenna elements for providing the test signal to the antenna elements, a number of probes for measuring at least one physical parameter, which is influenced by emissions of the antenna elements, and providing respective measurement signals, and a position determination unit for determining based on the measurement signals the positions of the antenna elements as calibrated positions.