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Experimental demonstration of an acousto-optic system for two-dimensional phased-array antenna scanning
Applied Optics
|September 8, 2010
Summary
This study demonstrates a new in-line interferometric acousto-optic system for 2D beam scanning in phased arrays. The novel architecture achieves precise phase control using two independent frequencies, enabling efficient beam steering.
Area of Science:
- Photonics
- Acousto-optics
- Antenna technology
Background:
- Phased arrays require precise beam steering for applications like radar and communication.
- Traditional beam scanning methods can be complex and limited in speed and accuracy.
Purpose of the Study:
- To demonstrate a novel in-line interferometric acousto-optic architecture for two-dimensional (2D) beam scanning.
- To achieve modulo-2pi phase control for planar phased arrays using independent control frequencies.
Main Methods:
- Experimental demonstration of a 330-MHz carrier system.
- Utilizing two independent control frequencies (f(1) and f(2)) with specific frequency variations for orthogonal phase control.
- Employing an interferometric acousto-optic approach for beam manipulation.
Main Results:
- Successful experimental demonstration of the 2D beam scanning architecture.
- Achieved modulo-2pi phase control along two orthogonal directions using frequency variations of 0-170 kHz and 0-210 kHz.
- Measured a processor output carrier signal-to-noise ratio of 48 dB at a 1-MHz offset within a 300 kHz analyzer bandwidth.
- Demonstrated a carrier tuning range of 90 MHz.
Conclusions:
- The novel in-line interferometric acousto-optic architecture is effective for 2D beam scanning in planar phased arrays.
- The system offers precise phase control and good signal-to-noise performance.
- This technology has potential for advanced radar and communication systems.
