Invention Description
Antennas are essential to multiple systems, such as mobile communications and military and civilian radars, security screening, imaging, mapping, localization, and much more. With the increased demand for accurate and optimal performance of such systems, it is critical to have precise knowledge of transmitted/received signals, which can be heavily influenced by any variation in the fabrication stage, damages, and any error that impacts these systems. System calibration is paramount to ensure proper usage, and because antennas transmit and receive the signals, their calibration is critical. However, this operation can be complex and time consuming as it needs the same target and setup for each recalibration.
Researchers at Arizona State University have developed an Enhanced Mutual Coupling Calibration (EMC²), a novel approach for calibrating large millimeter-wave antenna arrays used in MIMO communication and radar systems. This method actively enhances mutual coupling between antenna elements during calibration all while improving efficiency with fewer reference elements. EMC² operates in normal and calibration modes, maintaining system performance during regular operation. This technique addresses limitations in traditional Built-in Self-Test (BiST) system by using advanced radio frequency switch configurations and novel antenna array integration to maximize coupling bandwidth and strength.
This novel approach enhances mutual coupling in BiST-enabled antenna arrays to improve calibration accuracy and efficiency.
Potential Applications
- Millimeter-wave phased arrays for 5G & beyond wireless communications
- High-resolution automotive radar systems
- MIMO communication systems in telecommunications infrastructure
- Advanced radar systems in aerospace and defense sectors
- IoT networks utilizing large antenna arrays
Benefits and Advantages
- Improves calibration accuracy and robustness through enhanced mutual coupling
- Reduces the number of required reference elements during calibration
- Scalable across various frequency bands including millimeter-wave
- Supports integration with existing MIMO and radar antenna array systems
- Minimal impact on system performance
- Two independent states for operation and calibration
- Applicable to both linear and 2D antenna arrays