volume | PIER Journals

Abstract

The amplitude modulation (AM) and frequency modulation (FM) signal transmission of time modulated linear arrays (TMLA) is studied in this paper. The signal with a certain bandwidth received by a TMLA is time modulated by RF switches, generating many sideband signals at multiples of the time modulation frequency and each of them has the same bandwidth as the original signal. The AM and FM signals received by the TMLA were analyzed, and the requirements of the time modulation frequency for the recovery of the original signal is presented. Simulation results show that the time modulation frequency of the TMLA should be equal to or greater than the bandwidth of the original signal and a band-pass filter (BPF) has to be used to recover the original signal.

1. Marcano, D. and F. Duran, "Synthesis of antenna arrays using genetic algorithms," IEEE Antennas Propagat. Mag., Vol. 42, No. 3, 12-22, June 2000.
doi:10.1109/74.848944

2. Ayestarán, R. G., G., F. Las-Heras, and J. A. Martínez, "Non uniform-antenna array synthesis using neural networks," Journal of Electromagnetic Waves and Applications, Vol. 20, No. 8, 1001-1011, 2007.

3. Yuan, T., N. Yuan, L.-W. Li, and M.-S. Leong, "Design and analysis of phased antenna array with low sidelobe by fast algorithm," Progress In Electromagnetic Research, Vol. 87, 131-147, 2008.
doi:10.2528/PIER08092401

4. Bickmore, R. W., Time Versus Space in Antenna Theory, in Microwave Scanning Antennas, Vol. 3, R. C. Hansen (ed.), Academic Press, New York, 1966.

5. Kummer, W. H., A. T. Villeneuve, T. S. Fong, and F. G. Terrio, "Ultra-low sidelobes from time-modulated arrays," IEEE Trans. Antennas Propagat., Vol. 11, No. 5, 633-639, November 1963.
doi:10.1109/TAP.1963.1138102

6. Yang, S., Y. B. Gan, and A. Qing, "Moving phase center antenna arrays with optimized static excitations," Microw. Opt. Tech. Lett., Vol. 38, 83-85, July 2003.
doi:10.1002/mop.10977

7. Yang, S., Y. B. Gan, and P. K. Tan, "Comparative study of low sidelobe time modulated linear arrays with different time schemes," Journal of Electromagnetic Waves and Applications, Vol. 18, No. 11, 1443-1458, 2004.
doi:10.1163/1569393042954910

8. Yang, S., Y. B. Gan, and P. K. Tan, "Linear antenna arrays with bidirectional phase center motion," IEEE Trans. Antennas Propagat., Vol. 53, No. 5, 1829-1835, 2005.
doi:10.1109/TAP.2005.846754

9. Fondevila, J., J. C. Brégains, F. Ares, and E.Moreno, "Optimizing uniformly excited linear arrays through time modulation," IEEE Antennas Wireless Propagat. Lett., Vol. 3, 298-301, 2004.
doi:10.1109/LAWP.2004.838833

10. Yang, S., Y. B. Gan, and A. Qing, "Sideband suppression in time-modulated linear arrays by the differential evolution algorithm," IEEE Antennas Wireless Propagat. Lett., Vol. 1, 173-175, 2002.
doi:10.1109/LAWP.2002.807789

11. Yang, S., Y. B. Gan, and P. K. Tan, "A new technique for power-pattern synthesis in time-modulated linear arrays," IEEE Antennas Wireless Propagat. Lett., Vol. 2, 285-287, 2003.
doi:10.1109/LAWP.2003.821556

12. Yang, S., Y. B. Gan, A. Qing, and P. K. Tan, "Design of a uniform amplitude time modulated linear array with optimized time sequences ," IEEE Trans. Antennas Propagat., Vol. 53, No. 7, 2337-2339, July July.
doi:10.1109/TAP.2005.850765

13. Fondevila, J., J. C. Brégains, F. Ares, and E. Moreno, "Application of time modulation in the synthesis of sum and difference patterns by using linear arrays," Microw. Opt. Tech. Lett., Vol. 48, 829-832, May 2006.
doi:10.1002/mop.21489

14. Tennant, A. and B. Chambers, "A two-element time-modulated array with direction-finding properties," IEEE Antennas Wireless Propagat. Lett., Vol. 6, 64-65, 2007.
doi:10.1109/LAWP.2007.891953

15. Shanks, H. E., "A new technique for electronic scanning," IEEE Trans. Antennas Propag., Vol. 9, No. 2, 162-166, March 1961.
doi:10.1109/TAP.1961.1144965

16. Brégains, J. C., J. Fondevila-Gómez, G. Franceschetti, and F. Ares, "A first insight into the analysis of signal transmission and power losses in time-modulated linear arrays," IEEE Antenna Propagat. Symp., Vol. 1B, 831-834, 2005.

17. Brégains, J. C., J. Fondevila-Gómez, G. Franceschetti, and F. Ares, "Signal radiation and power losses of time-modulated arrays," IEEE Trans. Antennas Propagat., Vol. 56, No. 56, 1799-1804, June 2008.
doi:10.1109/TAP.2008.923345

18. Chen, Y., S. Yang, and Z. Nie, "The application of a modified differential evolution strategy to some array pattern synthesis problems ," IEEE Trans. Antennas Propagat., Vol. 56, No. 7, 1919-1927, July 2008.
doi:10.1109/TAP.2008.924713

Dr. Gang Li

Professor Shiwen Yang

Professor Zhiqin Zhao

Professor Zai-Ping Nie