Investigation of Time-Averaged Poynting Localized Energy Dynamics around Narrowband and Ultrawideband Antenna Systems

In this paper, we investigate the spatial dynamics of the recently discovered time-averaged Poynting localized energy around antennas using a finite-difference time-domain (FDTD) analysis technique. We consider two-port antenna systems comprised of: (i) narrowband thin-wire dipoles and (ii) ultrawideband (UWB) “fat” dipoles based on circular patches. Using FDTD, we characterize the S-parameters as well as evaluate the time-averaged localized energy distribution along an observation plane for differentiated Gaussian pulse excitation. Full-wave simulation results provide critical insight into energy signature manipulation in regions between closely spaced UWB antennas by changing their relative orientations. It is found that significant departure from S-parameters-based insights is revealed in the new localized energy data generated here using our method with practical antenna types as examples.

[1]  C. Wilcox.  An expansion theorem for electromagnetic fields , 1956 .

[2]  R. Collin,et al.  Evaluation of antenna Q , 1964 .

[3]  W. Geyi.  A method for the evaluation of small antenna Q , 2003 .

[4]  J.L. Volakis,et al.  Fundamental Limits and Design Guidelines for Miniaturizing Ultra-Wideband Antennas , 2009, IEEE Antennas and Propagation Magazine.

[5]  S. Mikki,et al.  A New Technique for the Analysis of Energy Coupling and Exchange in General Antenna Systems , 2015, IEEE Transactions on Antennas and Propagation.

[6]  G. Kaiser.  Conservation of reactive EM energy in reactive time , 2015, 2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting.

[7]  Lukas Jelinek,et al.  Stored electromagnetic energy and quality factor of radiating structures , 2014, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[8]  Guy A. E. Vandenbosch,et al.  Energy Stored by Radiating Systems , 2017, IEEE Access.

[9]  M. Manteghi.  Fundamental Limits, Bandwidth, and Information Rate of Electrically Small Antennas: Increasing the Throughput of an Antenna Without Violating the Thermodynamic Q-Factor , 2019, IEEE Antennas and Propagation Magazine.

[10]  S. Mikki,et al.  Consideration of Poynting Localized Energy Around Radiators: An FDTD-based Investigation , 2019, 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting.

[11]  K. Warnick,et al.  An Intuitive Way to Understand Mutual Coupling Effects in Antenna Arrays Using the Poynting Streamline Method , 2019, IEEE Transactions on Antennas and Propagation.

[12]  Y. Antar,et al.  Multifunctional Ultrawideband Antennas: Trends, Techniques and Applications , 2019 .

[13]  S. Mikki,et al.  ON LOCALIZED ANTENNA ENERGY IN ELECTROMAGNETIC RADIATION , 2019, Progress In Electromagnetics Research M.

[14]  S. Mikki,et al.  Dynamics of Antenna Reactive Energy Using Time-Domain IDM Method , 2019, IEEE Transactions on Antennas and Propagation.

[15]  S. Mikki,et al.  Space‐time analysis of energy localization: A Poynting flow perspective with applications to pattern reconfigurable dipoles , 2019, International journal of RF and microwave computer-aided engineering.

[16]  S. Mikki,et al.  Poynting Localized Energy: Method and Applications to Gain Enhancement in Coupled Antenna Systems , 2020, IEEE Transactions on Antennas and Propagation.