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Proceedings Paper

Reduction of backlobes and parasitic currents induced on nearby conducting structures by a conical horn antenna
Author(s): D. Robert Smith; F. C. Yang; Bob Torres; Carl E. Baum; William D. Prather; Tyrone C. Tran
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Paper Abstract

This paper presents the results of measurements of RF surface currents induced on the outside of a hollow, conducting tube by conical horn antenna located completely or partially inside the tube and radiating out of one end. The frequency range of the measurements was 0.8-1.6 GHz. We investigated several antenna modifications which were effective in reducing the surface over a narrow band of frequencies was a cylindrical cage of strips of microwave absorber foam material placed over the horn and extending one wavelength or more beyond the horn edge. The narrow, rectangular absorber strips are oriented parallel to the horn axis and are separated by gaps equal to the width of the strips. Reductions in tube surface currents of up to 30 dB over a bandwidth about 5% of the center frequency were observed with this structure with minimal impact upon the antenna gain. Variations on this structure using tapered absorbing strips overlapping tapered conducting strips reduced surface currents over a much broader bandwidth. Pattern measurements revealed a significant reduction in backlobe levels with the cage device. Qualitative explanations of the results are given.

Paper Details

Date Published: 8 September 1995
PDF: 6 pages
Proc. SPIE 2557, Intense Microwave Pulses III, (8 September 1995); doi: 10.1117/12.218552
Show Author Affiliations
D. Robert Smith, Kaman Sciences Corp. (United States)
F. C. Yang, Kaman Sciences Corp. (United States)
Bob Torres, Air Force Phillips Lab. (United States)
Carl E. Baum, Air Force Phillips Lab. (United States)
William D. Prather, Air Force Phillips Lab. (United States)
Tyrone C. Tran, Air Force Phillips Lab. (United States)

Published in SPIE Proceedings Vol. 2557:
Intense Microwave Pulses III
Howard E. Brandt, Editor(s)

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