Reduction of backlobes and parasitic currents induced on nearby conducting structures by a conical horn antenna

D. Robert Smith; F. C. Yang; Bob Torres; Carl E. Baum; William D. Prather; Tyrone C. Tran

doi:10.1117/12.218552

8 September 1995 Reduction of backlobes and parasitic currents induced on nearby conducting structures by a conical horn antenna

D. Robert Smith, F. C. Yang, Bob Torres, Carl E. Baum, William D. Prather, Tyrone C. Tran

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Proceedings Volume 2557, Intense Microwave Pulses III; (1995) https://doi.org/10.1117/12.218552
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

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D. Robert Smith, F. C. Yang, Bob Torres, Carl E. Baum, William D. Prather, and Tyrone C. Tran "Reduction of backlobes and parasitic currents induced on nearby conducting structures by a conical horn antenna", Proc. SPIE 2557, Intense Microwave Pulses III, (8 September 1995); https://doi.org/10.1117/12.218552

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KEYWORDS

Antennas

Metals

Sensors

Diffraction

Foam

Magnetism

Microwave radiation

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