| 摘要 |
A modified offset parabolic antenna is disclosed which provides improved gain when receiving satellite broadcasts from geosynchronous transmission sources spaced substantially 10 degrees apart. The surface of the reflector is defined by a Zernike expansion mapped to a unit circle. The values of the parameters of the Zernike expansion are selected to provide a shaped reflector surface which focuses beams from the three separate sources onto three focal points such that the gain of the antenna is maximized. A peak beam gain for an offset beam of substantially 33.9 dBi has been achieved.
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