volume | PIER Journals

Abstract

Two probe-compensated near-field-far-field transformations with spherical spiral scanning tailored for antennas having two of their dimensions very different from the third one are developed by properly applying the unified theory of spiral scans for nonspherical antennas. One is suitable for electrically long antennas, which are considered as enclosed in a cylinder ended in two half-spheres. The other adopts a surface formed by two circular ``bowls'' with the same aperture diameter but different lateral bends to shape a quasi-planar antenna. These flexible modelings fit very well many actual antennas by properly setting their geometric parameters. Great reduction of the number of data to be acquired is achieved, thus significantly reducing the required measurement time. Numerical tests validating the accuracy of the proposed techniques and their stability with respect to random errors affecting the data are shown.

1. "Special issue on near-field scanning techniques," IEEE Trans. Antennas Propagat., Vol. 36, 727-901, June 1988.
doi:10.1109/8.1173 Google Scholar

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

3. Yaccarino, R. G., L. I. Williams, and Y. Rahmat-Samii, "Linear spiral sampling for the bipolar planar antenna measurement technique," IEEE Trans. Antennas Propagat., Vol. 44, 1049-1051, July 1996.
doi:10.1109/8.504314 Google Scholar

4. Bucci, O. M., F. D’Agostino, C. Gennarelli, G. Riccio, and C. Savarese, "NF-FF transformation with spherical spiral scanning," IEEE Antennas Wireless Propagat. Lett., Vol. 2, 263-266, 2003.
doi:10.1109/LAWP.2003.820710 Google Scholar

5. D'Agostino, F., F. Ferrara, C. Gennarelli, G. Riccio, and C. Savarese, "Directivity computation by spherical spiral scanning in NF region," Journal Electromagnetic Waves and Applications, Vol. 19, No. 10, 1343-1358, 2005.
doi:10.1163/156939305775525927 Google Scholar

6. D'Agostino, F., C. Gennarelli, G. Riccio, and C. Savarese, "Theoretical foundations of near-field-far-field transformations with spiral scannings," Progress In Electromagnetics Research, Vol. 61, 193-214, 2006.
doi:10.2528/PIER06021401 Google Scholar

7. D'Agostino, F., F. Ferrara, C. Gennarelli, R. Guerriero, M. Migliozzi, and G. Riccio, "A nonredundant near-field to farfield transformation with spherical spiral scanning for nonspherical antennas," The Open Electrical & Electronic Eng. Jour., Vol. 3, 4-11, 2009. Google Scholar

8. 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 ropagat., Vol. 46, 351-359, March 1998.
doi:10.1109/8.662654 Google Scholar

9. Hansen, J. E., Spherical Near-field Antenna Measurements, IEE Electromagnetic Waves Series, Peter Peregrinus, London, UK, 1998.

10. D'Agostino, F., F. Ferrara, C. Gennarelli, R. Guerriero, and M. Migliozzi, "The unified theory of near-field-far-field transformations with spiral scannings for nonspherical antennas," Progress In Electromagnetics Research B, Vol. 14, 449-477, 2009.
doi:10.2528/PIERB09031808 Google Scholar

11. Bucci, O. M., G. D'Elia, and M. D. Migliore, "Advanced field interpolation from plane-polar samples: Experimental verification," IEEE Trans. Antennas Propagat., Vol. 46, 204-210, February 1998.
doi:10.1109/8.660964 Google Scholar

12. Bucci, O. M., F. D'Agostino, C. Gennarelli, G. Riccio, and C. Savarese, "Data reduction in the NF-FF transformation technique with spherical scanning," Journal Electromagnetic Waves and Applications, Vol. 15, No. 6, 755-775, 2001.
doi:10.1163/156939301X00995 Google Scholar

13. D'Agostino, F., F. Ferrara, C. Gennarelli, R. Guerriero, and M. Migliozzi, "Effective antenna modelings for NF-FF transformations with spherical scanning using the minimum number of data ," International Journal of Antennas and Propagation, 1687-5869, Article ID 936781, 2011. Google Scholar

Prof. Francesco D'Agostino

Dr. Flaminio Ferrara

Professor Claudio Gennarelli

Professor Rocco Guerriero

Dr. Massimo Migliozzi