Phased Array Antenna Calibration Using Reflected-Wave Feedback
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Solution Overview
Problem
Existing phased array antenna calibration methods require additional transmitters, making the calibration measurement system complex.
Innovation Solution
A phased array antenna calibration method that uses the phased array antenna itself, including transmission and reception modules, to adjust phase shifters and amplifiers based on reflected waves, allowing accurate calibration without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transmitter in addition to the phased array antenna is used for calibration, then calibration can be performed, but the calibration measurement system becomes complex
Solution Approach 1:
The patent combines the transmission and reception functions into a single phased array antenna system. The same antenna elements that transmit radio waves also receive the reflected waves, eliminating the need for a separate transmitter and simplifying the calibration measurement system while maintaining calibration accuracy.
Solution Approach 2:
The phased array antenna is designed to perform multiple functions: it can transmit radio waves for normal operation and receive reflected waves for calibration purposes. This multi-functionality eliminates the need for dedicated calibration equipment and reduces system complexity.
2Measurement precision
If additional transmitters are used for calibration, then calibration measurement can be performed, but the number of components increases
Solution Approach 1:
The patent merges the calibration measurement function with the existing phased array antenna components. The same transmission modules and reception module used for normal operation are utilized for calibration, reducing the quantity of components while maintaining measurement precision through the use of reflected wave analysis.
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
Enables accurate calibration using a simplified calibration measurement system by estimating and adjusting the amplitude and phase of transmission modules within the phased array antenna.
Implementation Method 1
a step of receiving, by the reception antenna, a reflected wave that is a radio wave transmitted from the transmission antenna of each of the multiple transmission modules and reflected outside the phased array antenna
Data Source
AI summary
A method for calibrating a phased array antenna is provided. The phased array antenna includes multiple transmission modules each including a phase shifter that changes a phase of a high frequency signal output from a signal source, an amplifier that amplifies an amplitude of the high frequency signal, and a transmission antenna that converts the high frequency signal into a radio wave, and a reception module including a reception antenna. The method includes a step of receiving, by the reception antenna, a reflected wave that is a radio wave transmitted from the transmission antenna of each of the multiple transmission modules and reflected outside the phased array antenna, and a step of adjusting the phase shifter and the amplifier of each of the multiple transmission modules based on an amplitude and a phase of the reflected wave received.