Patent ID: 6731249
Filing Date: 2004-05-04
Classification: H01Q

Abstract:
A multi-beam-reflector dish antenna system comprising:a reflector for simultaneously receiving signals from a plurality of satellites; and at least a first low noise block with integrated feed (LNBF) module for receiving focused waves, in which the reflector is formed according to the following steps of:providing the reflector having N-th order curve surface where the value of factor N equals to 2.1 returned by F(x)n+F(y)n=F(z); executing expansion according to the equation to achieve expansion of z&af;(t,Ï†)=&Sum;n0&it;&Sum;m0&it;[Cnm&it;â€ƒ&it;cos&it;â€ƒ&it;n&it;â€ƒ&it;Ï†+Dnm&it;â€ƒ&it;sin&it;â€ƒ&it;n&it;â€ƒ&it;Ï†]&it;Fmn&af;(t),â€ƒin which expansion coefficients of Cnm Dnm are variables; analyzing the radiation waveforms of the reflector according to the expansion coefficients of Cnm and Dnm; synthesizing the radiation waveforms of the reflector to generate a corresponding radiation pattern; and acquiring the multi-beam-reflector dish antenna according to the expansion coefficients, Cnm and Dnm, and the radiation pattern, wherein the values of the expansion coefficients Cnm and Dnm are substantially: nmCnmâ€ƒâ€ƒDnmâ€ƒâ€ƒ       00âˆ’6.8869650.00E+00â€‰01âˆ’0.40448810.00E+00â€‰024.81Eâˆ’030.00E+00â€‰03âˆ’6.92Eâˆ’040.00E+00â€‰100.00E+001.619216â€‰110.00E+00âˆ’9.52Eâˆ’03â€‰120.00E+00âˆ’2.61Eâˆ’04â€‰200.12380.00E+00â€‰21âˆ’6.41Eâˆ’030.00E+00â€‰221.00Eâˆ’050.00E+00â€‰300.00E+002.35Eâˆ’02â€‰310.00E+001.07Eâˆ’03â€‰40âˆ’1.44Eâˆ’030.00E+00â€‰411.12Eâˆ’030.00E+00â€‰500.00E+00âˆ’3.20Eâˆ’03â€‰60âˆ’2.12Eâˆ’030.00E+00.