Feed-Strut Scattering Effects on Small Parabolic Antenna Secondary Patterns

Katsumasa MIYATA; Michio SUZUKI

Feed-Strut Scattering Effects on Small Parabolic Antenna Secondary Patterns

Katsumasa MIYATA, Michio SUZUKI

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An experimental study of a strut-scattering contribution to small parabolic antenna secondary patterns is presented. The test reflector used in the measurement is the one with D (diameter)500 mm and with F (focal length)125 mm. In order to examine the strut effects on the reflector secondary patterns, all the data are measured two-dimensionally with a computer-aided antenna positioner. Two quantities, ψ_s (elevation angle) and φ_s (rotational angle varied from the plane of the source polarization), are introduced as the strut-position parameters. The results of the experiment done at f12 GHz with four struts (10 mm in diameter) show that the reflector patterns are considerably influenced by the strut. When, for example, φ_s0 and _s30, the H-plane first sidelobe level is found to increase to about -15 dB; the value for a non-strut parabola was -20.6 dB. The cross-polar levels are also disturbed. When φ_s45 and _s40, the cross-polar value is deteriorated to -22.5 dB; the corresponding value of a strut-free reflector was -37 dB. The loss of gain for a strut-free parabola was from 0.5 to 1.0 dB in this experiment. It is also experienced that for an one-strut parabola, on-axis cross polarization appears; the amount of which for φ_s45 and for _s70 was about 36 dB.

Publication: IEICE TRANSACTIONS on transactions Vol.E68-E No.9 pp.612-619

Publication Date: 1985/09/25

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Type of Manuscript: PAPER

Category: Antenna and Propagation

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Katsumasa MIYATA
Michio SUZUKI

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Katsumasa MIYATA, Michio SUZUKI, "Feed-Strut Scattering Effects on Small Parabolic Antenna Secondary Patterns" in IEICE TRANSACTIONS on transactions, vol. E68-E, no. 9, pp. 612-619, September 1985, doi: .
Abstract: An experimental study of a strut-scattering contribution to small parabolic antenna secondary patterns is presented. The test reflector used in the measurement is the one with D (diameter)500 mm and with F (focal length)125 mm. In order to examine the strut effects on the reflector secondary patterns, all the data are measured two-dimensionally with a computer-aided antenna positioner. Two quantities, ψ_s (elevation angle) and φ_s (rotational angle varied from the plane of the source polarization), are introduced as the strut-position parameters. The results of the experiment done at f12 GHz with four struts (10 mm in diameter) show that the reflector patterns are considerably influenced by the strut. When, for example, φ_s0 and _s30, the H-plane first sidelobe level is found to increase to about -15 dB; the value for a non-strut parabola was -20.6 dB. The cross-polar levels are also disturbed. When φ_s45 and _s40, the cross-polar value is deteriorated to -22.5 dB; the corresponding value of a strut-free reflector was -37 dB. The loss of gain for a strut-free parabola was from 0.5 to 1.0 dB in this experiment. It is also experienced that for an one-strut parabola, on-axis cross polarization appears; the amount of which for φ_s45 and for _s70 was about 36 dB.
URL: https://global.ieice.org/en_transactions/transactions/10.1587/e68-e_9_612/_p

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@ARTICLE{e68-e_9_612,
author={Katsumasa MIYATA, Michio SUZUKI, },
journal={IEICE TRANSACTIONS on transactions},
title={Feed-Strut Scattering Effects on Small Parabolic Antenna Secondary Patterns},
year={1985},
volume={E68-E},
number={9},
pages={612-619},
abstract={An experimental study of a strut-scattering contribution to small parabolic antenna secondary patterns is presented. The test reflector used in the measurement is the one with D (diameter)500 mm and with F (focal length)125 mm. In order to examine the strut effects on the reflector secondary patterns, all the data are measured two-dimensionally with a computer-aided antenna positioner. Two quantities, ψ_s (elevation angle) and φ_s (rotational angle varied from the plane of the source polarization), are introduced as the strut-position parameters. The results of the experiment done at f12 GHz with four struts (10 mm in diameter) show that the reflector patterns are considerably influenced by the strut. When, for example, φ_s0 and _s30, the H-plane first sidelobe level is found to increase to about -15 dB; the value for a non-strut parabola was -20.6 dB. The cross-polar levels are also disturbed. When φ_s45 and _s40, the cross-polar value is deteriorated to -22.5 dB; the corresponding value of a strut-free reflector was -37 dB. The loss of gain for a strut-free parabola was from 0.5 to 1.0 dB in this experiment. It is also experienced that for an one-strut parabola, on-axis cross polarization appears; the amount of which for φ_s45 and for _s70 was about 36 dB.},
keywords={},
doi={},
ISSN={},
month={September},}

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TY - JOUR
TI - Feed-Strut Scattering Effects on Small Parabolic Antenna Secondary Patterns
T2 - IEICE TRANSACTIONS on transactions
SP - 612
EP - 619
AU - Katsumasa MIYATA
AU - Michio SUZUKI
PY - 1985
DO -
JO - IEICE TRANSACTIONS on transactions
SN -
VL - E68-E
IS - 9
JA - IEICE TRANSACTIONS on transactions
Y1 - September 1985
AB - An experimental study of a strut-scattering contribution to small parabolic antenna secondary patterns is presented. The test reflector used in the measurement is the one with D (diameter)500 mm and with F (focal length)125 mm. In order to examine the strut effects on the reflector secondary patterns, all the data are measured two-dimensionally with a computer-aided antenna positioner. Two quantities, ψ_s (elevation angle) and φ_s (rotational angle varied from the plane of the source polarization), are introduced as the strut-position parameters. The results of the experiment done at f12 GHz with four struts (10 mm in diameter) show that the reflector patterns are considerably influenced by the strut. When, for example, φ_s0 and _s30, the H-plane first sidelobe level is found to increase to about -15 dB; the value for a non-strut parabola was -20.6 dB. The cross-polar levels are also disturbed. When φ_s45 and _s40, the cross-polar value is deteriorated to -22.5 dB; the corresponding value of a strut-free reflector was -37 dB. The loss of gain for a strut-free parabola was from 0.5 to 1.0 dB in this experiment. It is also experienced that for an one-strut parabola, on-axis cross polarization appears; the amount of which for φ_s45 and for _s70 was about 36 dB.
ER -