Post-Deadline Paper Filtering And Extending The Spectra Of Antenna Nearfields Reconstructed From Measurement On A Spherical Surface

G. Tricoles; E. L. Rope; R. A. Hayward

doi:10.1117/12.954728

9 July 1976 Post-Deadline Paper Filtering And Extending The Spectra Of Antenna Nearfields Reconstructed From Measurement On A Spherical Surface

G. Tricoles, E. L. Rope, R. A. Hayward

Author Affiliations +

Proceedings Volume 0074, Image Processing; (1976) https://doi.org/10.1117/12.954728
Event: Image Processing, 1976, Pacific Grove, United States

Abstract

The fields near radiating antennas are useful for evaluating the effects of dielectric housings or nearby metallic objects. This paper describes the determination and processing of fields produced by a small antenna in a metallic cone and by another, array antenna. The procedure was to first compute the complex-valued, rectangular components of the electric and magnetic fields near a radiating antenna from data measured on a spherical surface, with radius large enough to eliminate probe effects. Resolution was about half a wave-length, and speckle was pronounced at low intensities. The spectra of the reconstructed fields were computed, filtered, and slightly extended beyond the visible region. Resolution was changed slightly. Speckle amplitude was reduced, and an induced source near the cone tip was made more visible. The processed nearfields gave more accurate farfields then the original nearfields. The basis for the theory was verified by considering linear antennas. From assumed current distributions and farfields we showed the reconstruction is a convolution. This justified filtering. The assumed nearfields were exactly reconstructed by continuing the spectra. Filtering functions for the apertures were derived from theoretical cases and applied to the spectra computed from measured data.

Citation Download Citation

G. Tricoles, E. L. Rope, and R. A. Hayward "Post-Deadline Paper Filtering And Extending The Spectra Of Antenna Nearfields Reconstructed From Measurement On A Spherical Surface", Proc. SPIE 0074, Image Processing, (9 July 1976); https://doi.org/10.1117/12.954728

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