Fig. 1. Antenna array configuration
Fig. 2. Beam-steering configuration (a) (Az, El)=(0°, 0°), Black (b) (Az,El)=(0°, 30°), Red
Fig. 3. Beam-focusing simulation result where (Az, El)=(0°, 30°)
Fig. 4. Concept of near-field beam focusing
Fig. 5. Radiation characteristics from AESA antenna to focusing plane where (Az, El)=(0°, 0°), zf=2m
Fig. 6. Near-field beam focusing simulation result using calculated LUT where (Az, El)=(0°, 0°), zf=2m
Fig. 7. 3D graph of Eq. (5)
Fig. 8. 3d graph of Eq. (6)
Fig. 9. Beam-focusing simulation result
Fig. 10. Concept of near-field beam focusing using a single LUT(phase gradient for near-field focusing)
Fig. 11. Simulation results where zf=2m
Table 1. Beam focusing simulation result comparison between near-field and far-field where (Az, El)=(0°, 30°) and (0°, 45°)
Table 2. Beam focusing simulation result comparison between near-field and far-field where (Az, El)=(20°, 20°) and (30°, 30°)
References
- Feldle H. P. (2007) "State of the Active Phased Array Technology", IEEE International ITG Conference on Antennas, 241-245.
- Fenn, A. J. (1990) "Near-field testing of adaptive radar systems", The Lincoln Laboratory Journal 3(1), 23-40.
- Ju, H. S. and S. Y. Cho, J. So, S. B. Kim (2018) "Radiation Characteristics of Near-Field Beam Focusing for an Active Array Antenna", Proceedings of the International Symposium on Antennas and Propagation 2018, Busan, Korea, 769-770.
- Fenn, A. J. (2000) "The Development of Phased-Array Radar Technology", The Lincoln Laboratory Journal 12(2), 321-340.
- Balanis, C. A. (1982) "Antenna Theory Analysis and Design", John Wiley&Sons, 142-144.
- Sherman S. M. and Barton D. K. (2011) "Monopulse Principles and Techniques", Artech House, 77.
- Aumann H. M. (1995) "Phased array calibrations using measured element patterns", IEEE Antennas and Propagation Society International Symposium, 918-921.