Optimum Primary Radiator Tilt Angle of a Shaped Offset Dual Reflector Antenna.
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| Title: | Optimum Primary Radiator Tilt Angle of a Shaped Offset Dual Reflector Antenna. |
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| Authors: | Karikomi, Masahiro1, Kagoshima, Kenichi1 |
| Source: | Electronics & Communications in Japan, Part 1: Communications. Nov88, Vol. 71 Issue 11, p86-94. 9p. |
| Subjects: | Radiators, Reflector antennas, Optics, Electromagnetic waves, Radiation, Electronics, Communication, Physical sciences |
| Abstract: | When we shape reflector surfaces of an offset dual reflector antenna for a given desired aperture distribution, we create a phenomenon in which the direction of the reflected ray by the shaped surfaces and an assumed direction of radiation by geometric optics do not coincide. Hence, the characteristics of cross-polarized waves are degraded. If we shape the surfaces at a tilt angle of the main dish with respect to the direction of the main radiation pattern, we found that the directional errors become extremely small between the direction of the actually reflected ray and that of the assumed direction of radiation by geometric optics for an optimum tilt angle. At this tilt angle, we can shape the reflector surfaces satisfying almost all of the conditions imposed by geometric optics. When we shape the surfaces at the optimum tilt angle, we obtain continuous surfaces which generate a desired axisymmetric aperture distribution along the radial direction. We can design an offset dual reflector antenna with low sidelobes and favorable characteristics for cross-polarized waves. Based on this theory, we built an experimental offset Gregorian-type antenna with aperture diameter of about 50 λ. Measured results revealed excellent characteristics for cross-polarized waves and those for sidelobes. Thus, we confirmed the validity of the theory of shaping reflector surfaces. [ABSTRACT FROM AUTHOR] |
| Copyright of Electronics & Communications in Japan, Part 1: Communications is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Optimum Primary Radiator Tilt Angle of a Shaped Offset Dual Reflector Antenna. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Karikomi%2C+Masahiro%22">Karikomi, Masahiro</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kagoshima%2C+Kenichi%22">Kagoshima, Kenichi</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Electronics+%26+Communications+in+Japan%2C+Part+1%3A+Communications%22">Electronics & Communications in Japan, Part 1: Communications</searchLink>. Nov88, Vol. 71 Issue 11, p86-94. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Radiators%22">Radiators</searchLink><br /><searchLink fieldCode="DE" term="%22Reflector+antennas%22">Reflector antennas</searchLink><br /><searchLink fieldCode="DE" term="%22Optics%22">Optics</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnetic+waves%22">Electromagnetic waves</searchLink><br /><searchLink fieldCode="DE" term="%22Radiation%22">Radiation</searchLink><br /><searchLink fieldCode="DE" term="%22Electronics%22">Electronics</searchLink><br /><searchLink fieldCode="DE" term="%22Communication%22">Communication</searchLink><br /><searchLink fieldCode="DE" term="%22Physical+sciences%22">Physical sciences</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: When we shape reflector surfaces of an offset dual reflector antenna for a given desired aperture distribution, we create a phenomenon in which the direction of the reflected ray by the shaped surfaces and an assumed direction of radiation by geometric optics do not coincide. Hence, the characteristics of cross-polarized waves are degraded. If we shape the surfaces at a tilt angle of the main dish with respect to the direction of the main radiation pattern, we found that the directional errors become extremely small between the direction of the actually reflected ray and that of the assumed direction of radiation by geometric optics for an optimum tilt angle. At this tilt angle, we can shape the reflector surfaces satisfying almost all of the conditions imposed by geometric optics. When we shape the surfaces at the optimum tilt angle, we obtain continuous surfaces which generate a desired axisymmetric aperture distribution along the radial direction. We can design an offset dual reflector antenna with low sidelobes and favorable characteristics for cross-polarized waves. Based on this theory, we built an experimental offset Gregorian-type antenna with aperture diameter of about 50 λ. Measured results revealed excellent characteristics for cross-polarized waves and those for sidelobes. Thus, we confirmed the validity of the theory of shaping reflector surfaces. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Electronics & Communications in Japan, Part 1: Communications is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/ecja.4410711109 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 86 Subjects: – SubjectFull: Radiators Type: general – SubjectFull: Reflector antennas Type: general – SubjectFull: Optics Type: general – SubjectFull: Electromagnetic waves Type: general – SubjectFull: Radiation Type: general – SubjectFull: Electronics Type: general – SubjectFull: Communication Type: general – SubjectFull: Physical sciences Type: general Titles: – TitleFull: Optimum Primary Radiator Tilt Angle of a Shaped Offset Dual Reflector Antenna. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Karikomi, Masahiro – PersonEntity: Name: NameFull: Kagoshima, Kenichi IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: Nov88 Type: published Y: 1988 Identifiers: – Type: issn-print Value: 87566621 Numbering: – Type: volume Value: 71 – Type: issue Value: 11 Titles: – TitleFull: Electronics & Communications in Japan, Part 1: Communications Type: main |
| ResultId | 1 |
