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Abstract

In this paper we show that by means of an appropriate optimization technique the zeros of Rhodes radiation patterns can be perturbed so as to improve or modify pattern and/or the aperture distribution characteristics without altering the behaviour of the excitation amplitude distribution at the ends of the aperture. The examples presented include symmetric and asymmetric shaped beams, sum patterns with individually controlled side lobe heights, shaped beams generated by real excitations, and sum pattern aperture distributions that are smoother than the original Rhodes distribution.

1. Taylor, T. T., "Design of line-source antennas for narrow beam width and low side lobes," IRE Trans. Antenna Propagat., Vol. 3, 16-28, 1955.
doi:10.1109/TPGAP.1955.5720407 Google Scholar

2. Rhodes, D. R., "On the Taylor distribution," IEEE Trans. Antennas Propagat., Vol. 20, No. 2, 143-145, 1972.
doi:10.1109/TAP.1972.1140179 Google Scholar

3. Elliott, R. S., "Design of line-source antennas for sum patterns with side lobes of individually arbitrary heights," IEEE Trans. Antennas Propagat., Vol. 24, 76-83, 1976.
doi:10.1109/TAP.1976.1141287 Google Scholar

4. Ares, F., R. S. Elliott, and E. Moreno, "Optimised synthesis of shaped line-source antenna beams," Electronics Letters, Vol. 29, No. 12, 1136-1137, 1993.
doi:10.1049/el:19930758 Google Scholar

5. Ares, F. and J. A. Rodrıguez, "Asymmetric-shaped beam patterns from a continuous linear aperture distribution," Microwave Opt. Technol. Lett., Vol. 15, No. 5, 288-291, 1997.
doi:10.1002/(SICI)1098-2760(19970805)15:5<288::AID-MOP6>3.0.CO;2-5 Google Scholar

6. Ares, F., R. S. Elliott, and E. Moreno, "Synthesis of shaped linesource antenna beams using pure real distributions," Electronics Letters, Vol. 30, No. 4, 280-281, 1994.
doi:10.1049/el:19940226 Google Scholar

7. Ares, F. and J. A. Rodrıguez, "Smooth, efficient real amplitude distributions with no edge brightening for linear and circular near- Taylor sum patterns," Electronics Letters, Vol. 34, No. 7, 611-612, 1998.
doi:10.1049/el:19980471 Google Scholar

8. Press, W. H., S. A. Teukolsky, W. T. Vetterling, and B. P. Flannery, Numerical Recipes in C, 2nd Edition, 444–455, Cambridge University Press, 1992.

9. Orchard, H. J., R. S. Elliott, and G. D. Stern, "Optimising the synthesis of shaped beam antenna patterns," IEE Proc. Pt. H., Vol. 132, 63-68, 1985. Google Scholar

Dr. Julio C. Bregains

Dr. J. A. Rodriguez

Dr. F. Ares