Application of the geometrical theory of diffraction to Cassegrain subreflectors with laterally defocused feeds

O. Sørensen; W. Rusch

doi:10.1109/TAP.1975.1141142

Application of the geometrical theory of diffraction to Cassegrain subreflectors with laterally defocused feeds

O. Sørensen
, W. Rusch

Technical University of Denmark

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Abstract

The geometrical theory of diffraction (GTD) as formulated by R. G. Kouyoumjian has been applied to predict the radiation characteristics of hyperboloidal subreflectors with laterally defocused feeds. In caustic or multicaustic directions the scattered fields are determined using an equivalent ring current placed along the edge of the subreflector. The theoretical results are compared to measured amplitude and phase data. In order to improve the agreement, the blocking effects of the feed horn have been accounted for using the geometrical theory of diffraction. The calculated subreflector fields have been used to illuminate a paraboloid from which the scattered field is determined by physical optics. The results are compared to those obtained using a laterally defocused equivalent paraboloid.

Original language	English
Journal	I E E E Transactions on Antennas and Propagation
Volume	23
Issue number	5
Pages (from-to)	698-702
ISSN	0018-926X
DOIs	https://doi.org/10.1109/TAP.1975.1141142
Publication status	Published - 1975

Bibliographical note

Copyright: 1975 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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title = "Application of the geometrical theory of diffraction to Cassegrain subreflectors with laterally defocused feeds",

abstract = "The geometrical theory of diffraction (GTD) as formulated by R. G. Kouyoumjian has been applied to predict the radiation characteristics of hyperboloidal subreflectors with laterally defocused feeds. In caustic or multicaustic directions the scattered fields are determined using an equivalent ring current placed along the edge of the subreflector. The theoretical results are compared to measured amplitude and phase data. In order to improve the agreement, the blocking effects of the feed horn have been accounted for using the geometrical theory of diffraction. The calculated subreflector fields have been used to illuminate a paraboloid from which the scattered field is determined by physical optics. The results are compared to those obtained using a laterally defocused equivalent paraboloid.",

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note = "Copyright: 1975 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE",

year = "1975",

doi = "10.1109/TAP.1975.1141142",

language = "English",

volume = "23",

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T1 - Application of the geometrical theory of diffraction to Cassegrain subreflectors with laterally defocused feeds

AU - Sørensen, O.

AU - Rusch, W.

N1 - Copyright: 1975 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

PY - 1975

Y1 - 1975

N2 - The geometrical theory of diffraction (GTD) as formulated by R. G. Kouyoumjian has been applied to predict the radiation characteristics of hyperboloidal subreflectors with laterally defocused feeds. In caustic or multicaustic directions the scattered fields are determined using an equivalent ring current placed along the edge of the subreflector. The theoretical results are compared to measured amplitude and phase data. In order to improve the agreement, the blocking effects of the feed horn have been accounted for using the geometrical theory of diffraction. The calculated subreflector fields have been used to illuminate a paraboloid from which the scattered field is determined by physical optics. The results are compared to those obtained using a laterally defocused equivalent paraboloid.

AB - The geometrical theory of diffraction (GTD) as formulated by R. G. Kouyoumjian has been applied to predict the radiation characteristics of hyperboloidal subreflectors with laterally defocused feeds. In caustic or multicaustic directions the scattered fields are determined using an equivalent ring current placed along the edge of the subreflector. The theoretical results are compared to measured amplitude and phase data. In order to improve the agreement, the blocking effects of the feed horn have been accounted for using the geometrical theory of diffraction. The calculated subreflector fields have been used to illuminate a paraboloid from which the scattered field is determined by physical optics. The results are compared to those obtained using a laterally defocused equivalent paraboloid.

U2 - 10.1109/TAP.1975.1141142

DO - 10.1109/TAP.1975.1141142

M3 - Journal article

SN - 0018-926X

VL - 23

SP - 698

EP - 702

JO - I E E E Transactions on Antennas and Propagation

JF - I E E E Transactions on Antennas and Propagation

IS - 5

ER -

Application of the geometrical theory of diffraction to Cassegrain subreflectors with laterally defocused feeds

Abstract

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