Studying the Superluminal Behavior of UWB Antennas and Its Effect on Near-Field Imaging

In this paper, the superluminal behavior of a radiated pulse in the near-field of an ideal dipole and an ultrawideband antenna is explained and demonstrated through simulations and measurements. The deformation of the radiated pulse in the near-field is illustrated using the ideal dipole antenna rad...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2016-12, Vol.64 (12), p.5084-5093
Main Authors: Oloumi, Daniel, Rambabu, Karumudi
Format: Article
Language:English
Subjects:
Antenna measurements
Antenna near-field
Dipole antennas
EM pulses
Image quality
Image reconstruction
Near fields
near-field radar imaging
Pulse measurements
Radar imaging
superluminal pulse propagation
Synthetic aperture radar
Ultra wideband antennas
Ultrawideband
Vivaldi antennas
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Summary:In this paper, the superluminal behavior of a radiated pulse in the near-field of an ideal dipole and an ultrawideband antenna is explained and demonstrated through simulations and measurements. The deformation of the radiated pulse in the near-field is illustrated using the ideal dipole antenna radiation as well as by a Vivaldi antenna through full-wave simulations and measurements. The apparent superluminal pulse velocity is due to the pulse reshaping of the radiated pulse in the near-field of the antenna. The pulse velocity is measured by tracking pulse peak, pulse envelope peak, and also calculating the pulse centrovelocity. The superluminal pulse peak velocity of the radiated pulse from a miniaturized Vivaldi antenna is confirmed through measurements in face-to-face and quasi-monostatic radar configurations. The effect of different values of pulse velocities on the quality of reconstructed images using synthetic aperture radar processing is demonstrated as well.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2016.2620524