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Radiation Pattern Analysis of an Offset Cylindrical Reflector Antenna by Boundary Element Method
IEICE TRANSACTIONS (1976-1990) Vol.E70 No.8 pp.761-767
Publication Date: 1987/08/20
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Antennas and Propagation
Full Text: PDF(584.6KB)
Radiation patterns of an offset cylindrical reflector antenna are computed numerically by BEM (boundary element method), and compared with the corresponding measured patterns in order to seek the validity of the approach to the radiation pattern analysis for the whole angles without paying any attention to the combination of PO (physical optics) and GTD (geometrical theory od diffraction). First, a parallel-plate small horn antenna to be used as the primary feed for the offset reflector is analysed for the frequency range of 8 GHz to 12 GHz, and good agreement between the BEM and the measured radiation patterns (amplitude) is ascertained for the levels from 0 dB down to about 20 dB. Next, a small offset reflector antenna is manufactured, where the aperture width, the focal length, the offset angle, and the aperture angle are chosen 432 mm, 200 mm, 65and 40, respectively. It is shwon that the computed patterns by BEM (H-plane) is well verified by the measured data from the mainbeam to wide-angle regions, proving the validity of the approach to the field analysis of two-dimensional reflector antennas.