Multi-beam-reflector dish antenna and method for production thereof
AssigneeWistron Neweb Corp.
InventorsJiahn-Rong Gau, Cheng-Geng Jan, Chung-Min Lai
Life of this patent
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Abstract
A multi-beam-reflector dish antenna system. Signals from different satellites are simultaneously received using a single compound LNBF module. The antenna dish includes a reflector with N-th order projected aperture and a single compound LNBF module constituting multiple LNBF units. The reflector is formed by projected aperture cutting and surface distortion of the aperture in accordance with the method of analysis and synthesis. In addition to reflecting signals from satellites, it also generates focused waves sharing similar radiation patterns and horizontal gain with incoming waves on the focal plane to be received by the compound LNBF modules.
Claims14
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
-
- (
- t
- ,
- θ
- )
- =
- ∑
- 0
- n
-
- ∑
- 0
- m
-
- [
- C
-
-
- n
-
-
- m
-
-
- cos
-
-
- n
-
-
- θ
- +
- D
-
-
- n
-
-
- m
-
-
- sin
-
-
- n
-
-
- θ
- ]
-
- F
- m
- n
-
- (
- t
- )
- ,
- in which expansion coefficients of Cnm and 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:
- n
- m
- Cnm
- Dnm
- 0
- 0
- −6.886965
- 0.00E+00
- 0
- 1
- −0.4044881
- 0.00E+00
- 0
- 2
- 4.81E−03
- 0.00E+00
- 0
- 3
- −6.92E−04
- 0.00E+00
- 1
- 0
- 0.00E+00
- 1.619216
- 1
- 1
- 0.00E+00
- −9.52E−03
- 1
- 2
- 0.00E+00
- −2.61E−04
- 2
- 0
- 0.1238
- 0.00E+00
- 2
- 1
- −6.41E−03
- 0.00E+00
- 2
- 2
- 1.00E−05
- 0.00E+00
- 3
- 0
- 0.00E+00
- 2.35E−02
- 3
- 1
- 0.00E+00
- 1.07E−03
- 4
- 0
- −1.44E−03
- 0.00E+00
- 4
- 1
- 1.12E−03
- 0.00E+00
- 5
- 0
- 0.00E+00
- −3.20E−03
- 6
- 0
- −2.12E−03
- 0.00E+00
- wherein the values of Cnm and Dnm are zero when corresponding variables n and m are not listed.
A method for producing a multi-beam-reflector dish antenna system, the method comprising:
- providing the antenna system with a reflector having N-th order curve 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 the expansion of
- z
-
- (
- t
- ,
- θ
- )
- =
- ∑
- 0
- n
-
- ∑
- 0
- m
-
- [
- C
-
-
- n
-
-
- m
-
-
- cos
-
-
- n
-
-
- θ
- +
- D
-
-
- n
-
-
- m
-
-
- sin
-
-
- n
-
-
- θ
- ]
-
- F
- m
- n
-
- (
- t
- )
- ,
- in which the expansion coefficients of Cnm and Dnm are variables;
- analyzing the radiation waveforms of the reflector according to the expansion coefficients of Cnm and Dnm, the radiation waveforms received by a first LNBF module;
- synthesizing the radiation waveforms of the reflector to generate a corresponding radiation pattern;
- and
- drawing 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:
- n
- m
- Cnm
- Dnm
- 0
- 0
- −6.886965
- 0.00E+00
- 0
- 1
- −0.4044881
- 0.00E+00
- 0
- 2
- 4.81E−03
- 0.00E+00
- 0
- 3
- −6.92E−04
- 0.00E+00
- 1
- 0
- 0.00E+00
- 1.619216
- 1
- 1
- 0.00E+00
- −9.52E−03
- 1
- 2
- 0.00E+00
- −2.61E−04
- 2
- 0
- 0.1238
- 0.00E+00
- 2
- 1
- −6.41E−03
- 0.00E+00
- 2
- 2
- 1.00E−05
- 0.00E+00
- 3
- 0
- 0.00E+00
- 2.35E−02
- 3
- 1
- 0.00E+00
- 1.07E−03
- 4
- 0
- −1.44E−03
- 0.00E+00
- 4
- 1
- 1.12E−03
- 0.00E+00
- 5
- 0
- 0.00E+00
- −3.20E−03
- 6
- 0
- −2.12E−03
- 0.00E+00
- wherein the values of Cnm and Dnm are zero when corresponding variables n and m are not listed.
Dependencies are inferred from the claim text.