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2020-03-31

Theory of Nonsinusoidal Small Antennas for Near-Field Communication System Analysis

By Said Mikki
Progress In Electromagnetics Research B, Vol. 86, 177-193, 2020
doi:10.2528/PIERB19121104

Abstract

We provide a conceptual and theoretical analysis of nonsinusoidal antennas with emphasis on how electromagnetics and communication theories can be integrated to propose ideas for near-field (NF) communications systems utilizing future antennas. It is shown through rigorous analysis that in nonsinusoidal antennas it is possible to derive and solve ordinary differential equations giving specialized time-domain excitation signals that lead to exact cancellation of the near field at specific radiation spheres. This opens the door to building NF communications systems with far-field-like communication receiver infrastructures utilized if the receive antenna is placed at the special sphere where the NF component is made to vanish. We deploy exact current Green's function analysis method and completely avoid the use of any frequency-domain method. Complete expressions of the electromagnetic near- and far-field contributions to all signals propagating from the source to the receiver are then derived and their physical content discussed. The distortion effects and signal-to-noise rations due to the near-field are also identified and derived theoretically. It is found that using this specialized pulse excitation method in nonsinusoidal antennas, distortion caused by near-field components can be eliminated at critical distances between the source and the receiver. Realization issues of this system are briefly discussed together with some potential applications.

Citation


Said Mikki, "Theory of Nonsinusoidal Small Antennas for Near-Field Communication System Analysis," Progress In Electromagnetics Research B, Vol. 86, 177-193, 2020.
doi:10.2528/PIERB19121104
http://www.jpier.org/PIERB/pier.php?paper=19121104

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