volume | PIER Journals

Abstract

This paper studies the effect of three important parameters in planar time-domain (TD) near-field (NF) to far-field (FF) transformation. These parameters are the NF spatial sampling, NF measurement distance and scan surface truncation. The effect of these parameters over the TD FF accuracy are difficult to predict for Ultra Wide Band antennas. In this paper we aim to choose the optimum NF measurement parameters guaranteeing accurate calculation of the time-domain far-field. This allows the optimization of the computation time and memory requirements. Computations using analytic array of elementary dipoles radiation pattern are used to study the impact of each parameter in time-domain near-field antenna measurement. The comparison of the far-field results are presented in time and frequency domains. In particular, it is shown that the choice of the measurement distance and the size of the scan surface decide predominantly on the frequency band of accurate FF calculation. The used formalism in this paper for the NF to FF transformation is based on the Green's function.

1. Jin, X.-H., X.-D. Huang, C.-H. Cheng, and L. Zhu, "Super-wideband printed asymmetrical dipole antenna," Progress In Electromagnetics Research Letters, Vol. 27, 117-123, 2011.
doi:10.2528/PIERL11090506

2. Tuovinen, T. and M. Berg, "Impedance dependency on planar broadband dipole dimensions: An examination with antenna equivalent circuits," Progress In Electromagnetics Research, Vol. 144, 249-260, 2014.
doi:10.2528/PIER13112202

3. Akhoondzadeh-Asl, L., M. Fardis, A. Abolghasemi, and G. R. Dadashzadeh, "Frequency and time domain characteristic of a novel notch frequency UWB antenna," Progress In Electromagnetics Research, Vol. 80, 337-348, 2008.
doi:10.2528/PIER07120202

4. Tuovinen, T., M. Berg, and J. Iinatti, "Analysis of the impedance behaviour for broadband dipoles in proximity of a body tissue: Approach by using antenna equivalent circuits," Progress In Electromagnetics Research B, Vol. 59, 135-150, 2014.
doi:10.2528/PIERB14021902

5. Tsai, C.-L., "A coplanar-strip dipole antenna for broadband circular polarization operation," Progress In Electromagnetics Research, Vol. 121, 141-157, 2011.
doi:10.2528/PIER11082407

6. Yaghjian, A. D., "An overview of near-field antenna measurements," IEEE Transactions on Antennas and Propagation, Vol. 34, No. 1, 30-45, 1986.
doi:10.1109/TAP.1986.1143727

7. Blech, M. D., M. M. Leibfritz, R. Hellinger, D. Geier, F. A. Maier, A. M. Pietsch, and T. F. Eibert, "A time domain spherical near-field measurement facility for UWB antennas employing a hardware gating technique," Adv. Radio Sci., Vol. 8, 243-250, 2010.
doi:10.5194/ars-8-243-2010

8. Jinhwan, K., A. De, T. K. Sarkar, M. Hongsik, W. Zhao, and M. Salazar-Palma, "Free space radiation pattern reconstruction from non-anechoic measurements using an impulse response of the environment," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 2, 821-831, 2012.
doi:10.1109/TAP.2011.2173117

9. Liu, Y. and B. Ravelo, "Fully time-domain scanning of EM near-field radiated by RF circuits," Progress In Electromagnetics Research B, Vol. 57, 21-46, 2014.

10. Hansen, T. B. and A. D. Yaghjian, Plane-wave Theory of Time-domain Fields, Near-field Scanning Applications, IEEE Press, New York, 1999.
doi:10.1109/9780470545522

11. Bucci, O. M., G. D’Elia, and D. Migliore, "Near-field far-field transformation in time domain from optimal plane-polar samples," IEEE Transactions on Antennas and Propagation, Vol. 46, No. 7, 1084-1088, 1998.
doi:10.1109/8.704812

12. Bucci, O. M., G. D’Elia, and D. Migliore, "Optimal time-domain field interpolation from plane-polar samples," IEEE Transactions on Antennas and Propagation, Vol. 45, No. 6, 989-994, 1997.
doi:10.1109/8.585746

13. Bucci, O. M., C. Gennarelli, and C. Savarese, "Representation of electromagnetic fields over arbitrary surfaces by a finite and nonredundant number of samples," IEEE Transactions on Antennas and Propagation, Vol. 46, No. 3, 351-359, 1998.
doi:10.1109/8.662654

14. Wang, J. J. H., "An examination of the theory and practices of planar near-field measurement," IEEE Transactions on Antennas and Propagation, Vol. 36, No. 6, 746-753, 1988.
doi:10.1109/8.1176

15. Levitas, B., M. Drozdov, I. Naidionova, S. Jefremov, S. Malyshev, and A. Chizh, "UWB system for time-domain near-field antenna measurement," 2013 European Microwave Conference (EuMC), 388-391, Oct. 6-10, 2013.

16. Serhir, M. and D. Picard, "Development of pulsed antennas measurement facility: Near field antennas measurement in time domain," 2012 15th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM), 1-4, Jun. 25-28, 2012.

17. De Jough, R. V., M. Hajian, and L. P. Ligthart, "Antenna time-domain measurement techniques," IEEE Antennas and Propagation Magazine, Vol. 39, No. 5, 7-11, 1997.
doi:10.1109/74.637102

18. Serhir, M. and D. Picard, "An efficient near field to near or far field transformation in time domain," 2013 European Microwave Conference (EuMC), 1095-1098, Oct. 6-10, 2013.

Dr. Mohammed Serhir