volume | PIER Journals

Abstract

We apply the ESPRIT algorithm to decompose the currents on a helical antenna into different traveling wave modes. The strengths, phase velocities and decay constants of the various modes are extracted across frequencies. Their contributions to the antenna performance including gain, polarization and time-domain radiated pulse shape are investigated. Our results show that the T₀⁺ mode is a dominant contributor to the helix gain at the low end of the frequency band while the T₁⁺ mode contributes significantly to the gain at higher frequencies. It is also found that the reflected current modes from the open end reduce the circular polarization purity of the helix. Lastly, it is observed that the T₁⁺ and T₀⁺ modes contribute constructively to a low-dispersion pulse from the antenna.

1. Kraus, J. D., "Helical beam antennas for wide-band applications," Proc. IRE, Vol. 36, 1236-1242, Oct. 1948.
doi:10.1109/JRPROC.1948.231603 Google Scholar

2. Kraus, J. D. and R. J. Marhefka, Antennas for All Applications, 3rd Edition, McGraw Hill, 2002.

3. Nakano, H., Helical and Spiral Antennas --- A Numerical Approach, Wiley and Sons, 1987.

4. Mayes, J. R., W. J. Carey, W. C. Nunnally, and L. Altgilbers, "The Marx generator as an ultra wideband source," Pulsed Power Plasma Science, 510, 2001. Google Scholar

5. Giri, D. V., J. S. Levine, F. M. Tesche, and Y. Rahmat-Samii, "Numerical modeling of helical antenna excited by transient waveforms," Directed Energy Test and Evaluation Conference, Albuquerque, NM, 2007. Google Scholar

6. Maclean, T. S. M. and R. G. Kouyoumjian, "The bandwidth of helical antennas," IRE Trans. Antennas Propagat., Vol. 7, 379-386, Dec. 1959. Google Scholar

7. Ghosh, S., A. K. Sinha, R. K. Gupta, S. N. Joshi, P. K. Jain, and B. N. Basu, "Space-harmonic effects in helical slow-wave structure --- An equivalent circuit analysis," Progress In Electromagnetics Research, Vol. 30, 85-104, 2001.
doi:10.2528/PIER00011001 Google Scholar

8. Marsh, J. A., "Current distributions on helical antennas," Proc. IRE, Vol. 39, 668-675, Jun. 1951.
doi:10.1109/JRPROC.1951.234127 Google Scholar

9. Roy, R., A. Paulraj, and T. Kailath, "ESPRIT --- A subspace rotation approach to estimation of parameters of cisoids in noise," IEEE Trans. Acoust., Speech, Signal Processing, Vol. 34, 1340-1342, Oct. 1986.
doi:10.1109/TASSP.1986.1164935 Google Scholar

10. Li, Y., H. Ling, M. Mayes, and J. Mayes, "Current decomposition in helical antennas using ESPRIT," IEEE Antennas Propagation Society International Symposium, 1237-1240, San Diego, CA, Jul. 2008. Google Scholar

11. Wang, Y. and H. Ling, "Multimode parameter extraction for multiconductor transmission lines via single-pass FDTD and signal-processing techniques," IEEE Trans. Microwave Theory Tech., Vol. 46, 89-96, Jan. 1998.
doi:10.1109/22.654927 Google Scholar

12. Li, Y. and H. Ling, "Extraction of wave propagation mechanisms in a cut-wire array using the ESPRIT algorithm," IEEE Antennas Wireless Propagat. Lett., Vol. 8, 744-747, May 2009.
doi:10.1109/LAWP.2009.2021866 Google Scholar

13. Hurst, M. P. and R. Mittra, "Scattering center analysis via Prony's method," IEEE Trans. Antennas Propagat., Vol. 35, 986-988, Aug. 1987.
doi:10.1109/TAP.1987.1144210 Google Scholar

14. Schmidt, R. O., "Multiple emitter location and signal parameter estimation," IEEE Trans. Antennas Propagat., Vol. 34, 276-280, Mar. 1986.
doi:10.1109/TAP.1986.1143830 Google Scholar

15. Nakano, H., Y. Samada, and J. Yamauchi, "Axial mode helical antennas," IEEE Trans. Antennas Propagat., Vol. 34, 1143-1148, Sep. 1986.
doi:10.1109/TAP.1986.1143944 Google Scholar

16. Ghosh, D., A. De, M. C. Taylor, T. K. Sarkar, M. C. Wicks, and E. L. Mokole, "Transmission and reception by ultra-wideband (UWB) antennas," IEEE Antennas Propagation Magazine, Vol. 48, 67-99, Oct. 2006.
doi:10.1109/MAP.2006.277157 Google Scholar

Dr. Yang Li

Professor Hao Ling