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Parabolic dish antenna with offset elliptical multi‐mode feeds for space‐borne remote‐sensing applications
Author(s) -
Sharma S. B.,
Singh V. K.,
Chakrabarty S. B.
Publication year - 2003
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.11150
Subject(s) - optics , offset (computer science) , parabolic reflector , feed horn , offset dish antenna , reflector (photography) , microwave , cassegrain antenna , parabolic antenna , aperture (computer memory) , fan beam antenna , physics , polarization (electrochemistry) , radiation pattern , beam (structure) , azimuth , side lobe , antenna (radio) , antenna aperture , periscope antenna , engineering , electrical engineering , acoustics , computer science , light source , chemistry , quantum mechanics , programming language
This paper presents the design and development of a pencil‐beam scanning parabolic reflector antenna with new multi‐mode elliptical feeds for space‐borne scatterometer application. The feeds have been laterally displaced in the focal plane of the reflector in order to achieve two squinted elliptical beams with the required angular spacing. The asymmetry in the secondary beams has been realized by illuminating the reflector with elliptic sectoral patterns of the elliptical feeds. Sectoral patterns have been synthesized by coupling power into higher‐order modes at the feed aperture. Using this new type of feed, a gain improvement on the order of 0.7 dBi has been achieved, as compared to the reflector antennas illuminated by elliptic feeds of nonsectoral patterns. The computed and measured data on primary and secondary radiation patterns have been presented. The desired gain, beam widths, beam asymmetry, angular spacing between the beams, side‐lobe level, and cross‐polarization level have been achieved. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 138–141, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11150