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A corner-reflector antenna having reflecting surfaces ten wavelengths wide and two wavelengths long was constructed, adjusted, and tested. The driven element was a collinear array of ten half-wave dipoles. Dolph-Chebyshev current distribution designed for side-lobe suppressions to ?45 decibels was computed. The currents in the dipoles were adjusted as nearly as possible to this distribution. The phase of the dipole currents was graded so as to slew the main beam 10? off the forward direction. The radiation patterns were measured and found to be quite close to the computed. Check of pattern stability with time and with changes in temperature and weather conditions showed it to be quite stable. Measurements of radiation pattern at frequencies departing from design frequency showed the operating bandwidth (determined by the preservation of the pattern) to be adequate for the applications likely to be considered for such antennas. The half-power beam widths of the main lobe were 9.8? in the E-plane and 32? in the H-plane. On the basis of the measured beamwidths, the gain was calculated to be approximately 21.2 decibels relative to an isotropic radiator. The gain was experimentally measured to be 21.2 decibels.
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High-gain, very low side-lobe antenna with capability for beam slewing
Wilson, Alvin C.
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