volume | PIER Journals

Abstract

This paper is devoted to the experimental validation of two direct near-field-far-field transformations with cylindrical scanning for elongated antennas requiring a minimum number of near-field measurements. They rely on the nonredundant sampling representations of electromagnetic fields and employ two different source modellings suitable to deal with electrically long antennas. These transformations allow the accurate reconstruction of the antenna far-field pattern in any cut plane directly from the collected near-field data without interpolating them. Their effectiveness is assessed by the good agreement between the so recovered far-field patterns and those obtained by means of the classical near-field-far-field transformation with cylindrical scanning.

1. Appel-Hansen, J., J. D. Dyson, E. S. Gillespie, and T. G. Hickman, "Antenna measurements," The Handbook of Antenna Design, A. W. Rudge, K. Milne, A. D. Olver, and P. Knight, Eds., Chapter 8, Peter Peregrinus Ltd., London, UK, 1982. Google Scholar

2. Yaghjian, A. D., "An overview of near-field antenna measurements," IEEE Trans. Antennas Propagat., Vol. 34, 30-45, Jan. 1986.
doi:10.1109/TAP.1986.1143727 Google Scholar

3. Gillespie, E. S., "Special Issue on near-field scanning techniques," IEEE Trans. Antennas Propagat., Vol. 36, 727-901, Jun. 1988.
doi:10.1109/8.1173 Google Scholar

4. Gennarelli, C., G. Riccio, F. D’Agostino, and F. Ferrara, "Nearfield- far-field Transformation Techniques,", Vol. 1, CUES, Salerno, Italy, 2004. Google Scholar

5. Francis, M. H. and R. W. Wittmann, "Near-field scanning measurements: Theory and practice," Modern Antenna Handbook, C. A. Balanis, Ed., Chapter 19, JohnWiley & Sons, Inc., Hoboken, NJ, USA, 2008. Google Scholar

6. Leach, Jr., W. M. and D. T. Paris, "Probe compensated near-field measurements on a cylinder," IEEE Trans. Antennas Propagat., Vol. 21, 435-445, Jul. 1973.
doi:10.1109/TAP.1973.1140520 Google Scholar

7. Yaghjian, A. D., "Near-field antenna measurement on a cylindrical surface: A source scattering matrix formulation,", NBS Tech. Note 696, U.S. Government Printing Office, Washington, DC, Sep. 1977. Google Scholar

8. Joy, E. B., W. M. Leach, Jr., G. P. Rodrigue, and D. T. Paris, "Applications of probe-compensated near-field measurements," IEEE Trans. Antennas Propagat., Vol. 26, 379-389, May 1978.
doi:10.1109/TAP.1978.1141856 Google Scholar

9. Borgiotti, G. V., "Integral equation formulation for probe corrected far-field reconstruction from measurements on a cylinder," IEEE Trans. Antennas Propagat., Vol. 26, 572-578, Jul. 1978.
doi:10.1109/TAP.1978.1141896 Google Scholar

10. Appel-Hansen, J., "On cylindrical near-field scanning techniques," IEEE Trans. Antennas Propagat., Vol. 28, 231-234, Mar. 1980.
doi:10.1109/TAP.1980.1142298 Google Scholar

11. Bucci, O. M. and C. Gennarelli, "Use of sampling expansions in near-field-far-field transformations: The cylindrical case," IEEE Trans. Antennas Propagat., Vol. 36, 830-835, Jun. 1988.
doi:10.1109/8.1185 Google Scholar

12. Bucci, O. M., C. Gennarelli, G. Riccio, and C. Savarese, "Non redundant representation of the electromagnetic fields over a cylinder with application to the near-field-far-field transformation," Electromagnetics, Vol. 16, 273-290, May 1996.
doi:10.1080/02726349608908477 Google Scholar

13. Bucci, O. M., C. Gennarelli, G. Riccio, and C. Savarese, "NF-FF transformation with cylindrical scanning: An effective technique for elongated antennas," IEE Proc. — Microw., Antennas and Propagat., Vol. 145, 369-374, Oct. 1998.
doi:10.1049/ip-map:19982248 Google Scholar

14. D’Agostino, F., F. Ferrara, C. Gennarelli, G. Riccio, and C. Savarese, "NF-FF transformation with cylindrical scanning from a minimum number of data," Microw. Opt. Technol. Lett., Vol. 35, 264-270, Nov. 2002.
doi:10.1002/mop.10578 Google Scholar

15. Bucci, O. M. and G. Franceschetti, "On the spatial bandwidth of scattered fields," IEEE Trans. Antennas Propagat., Vol. 35, 1445-1455, Dec. 1987.
doi:10.1109/TAP.1987.1144024 Google Scholar

16. Bucci, O. M., C. Gennarelli, and C. Savarese, "Representation of electromagnetic fields over arbitrary surfaces by a finite and nonredundant number of samples," IEEE Trans. Antennas Propagat., Vol. 46, 351-359, Mar. 1998.
doi:10.1109/8.662654 Google Scholar

17. Bucci, O. M. and C. Gennarelli, "Application of nonredundant sampling representations of electromagnetic fields to NF-FF transformation techniques," Int. Jour. of Antennas and Propagat., Vol. 2012, Article ID 319856, 14 pages, 2012. Google Scholar

18. D’Agostino, F., F. Ferrara, C. Gennarelli, R. Guerriero, and M. Migliozzi, "On the direct nonredundant near-field-farfield transformation in a cylindrical scanning geometry," IEEE Antennas Propagat. Magazine, Vol. 54, 130-138, Feb. 2012.
doi:10.1109/MAP.2012.6202525 Google Scholar

19. D’Agostino, F., F. Ferrara, C. Gennarelli, R. Guerriero, and M. Migliozzi, "Laboratory tests assessing the effectiveness of the NF-FF transformation with helicoidal scanning for electrically long antennas," Progress In Electromagnetics Research, Vol. 98, 375-388, 2009.
doi:10.2528/PIER09092303 Google Scholar

20. Yaghjian, A. D., "Approximate formulas for the far field and gain of open-ended rectangular waveguide," IEEE Trans. Antennas Propagat., Vol. 34, 378-384, Apr. 1984.
doi:10.1109/TAP.1984.1143332 Google Scholar

Prof. Francesco D'Agostino

Dr. Flaminio Ferrara

Professor Claudio Gennarelli

Dr. Gianluca Gennarelli

Professor Rocco Guerriero

Dr. Massimo Migliozzi