Very small aperture terminal & antenna for use therein
First Claim
1. A data transmitting/receiving satellite terminal for transmitting to and receiving from a geosynchronous satellite comprising:
- a) an antenna having an aperture forming an antenna receiving pattern with nulls at a first frequency, said nulls corresponding to satellites spaced at regular intervals from the satellite; and
b) a phase and amplitude compensation network coupled to said antenna, said compensation network adjusting a phase and amplitude of a transmitted signal to compensate for transmitting at a second frequency different than the first frequency, wherein the antenna aperture further comprises a main parabolic reflector and two side parabolic reflectors.
3 Assignments
0 Petitions
Accused Products
Abstract
A data transmitting/receiving satellite terminal for transmitting to and receiving from a geosynchronous satellite employs an antenna having nulls in its antenna receiving pattern at a first frequency corresponding to satellites spaced at regular intervals from the satellite. In addition, a phase and amplitude compensation network adjusts a phase and amplitude of the transmitted signal to compensate for transmitting at a different frequency than for which the antenna is optimally designed. The antenna includes a main parabolic reflector, and two side parabolic reflectors offset from a plane parallel to the main parabolic reflector. Each of the reflectors uses a dual frequency feed horn to couple energy to and from the reflector to a dipole exciter to which the receiving electronics is coupled. The above terminal is particularly useful in C-Band applications.
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Citations
13 Claims
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1. A data transmitting/receiving satellite terminal for transmitting to and receiving from a geosynchronous satellite comprising:
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a) an antenna having an aperture forming an antenna receiving pattern with nulls at a first frequency, said nulls corresponding to satellites spaced at regular intervals from the satellite; and b) a phase and amplitude compensation network coupled to said antenna, said compensation network adjusting a phase and amplitude of a transmitted signal to compensate for transmitting at a second frequency different than the first frequency, wherein the antenna aperture further comprises a main parabolic reflector and two side parabolic reflectors. - View Dependent Claims (2, 3, 4)
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5. An apparatus for sending signals to and receiving signals from a satellite, comprising:
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a) means for creating nulls in a receiving antenna pattern matched to satellites spaced from the satellite at regular intervals, which receiving antenna pattern is defined at a first frequency; and b) means for compensating for a transmitting antenna pattern by adjusting a phase and amplitude of a transmitted signal, which transmitting antenna pattern is defined at a second frequency, wherein the means for creating nulls comprises a main parabolic reflector, and two side parabolic reflectors. - View Dependent Claims (6, 7, 8)
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9. A data transceiver for transmitting to and receiving from within a satellite system, which includes a desired satellite and a plurality of interfering satellites, comprising:
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an antenna having an aperture shaped to create an antenna receiving pattern including a main lobe having gain for the received signal at a first frequency from the desired satellite and a null for each of at least four of the plurality of interfering satellites; and a phase and amplitude compensation network coupled to said antenna, said compensation network adjusting a phase and amplitude of a transmitted signal to compensate for transmitting at a frequency different than the first frequency, wherein the aperture has at least three primary areas, and wherein said compensation network adjusts the phase and amplitude of a transmitted signal to each of the three primary areas of said antenna.
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10. A data transceiver for receiving at a first frequency from and transmitting at a second frequency to a first satellite having at least four adjacent satellites, comprising:
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an antenna shaped to form an antenna receiving pattern including a main lobe having a null for each of the four adjacent satellites; and a phase and amplitude compensation network connected to said antenna, said compensation network adjusting the phase and amplitude of a transmitted signal to form an antenna transmitting pattern including a main lobe having a null for each of the four adjacent satellites, wherein said antenna includes three primary areas, and wherein said compensation network adjusts the phase and amplitude of a transmitted signal to each of the three primary areas of said antenna. - View Dependent Claims (11)
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12. A data transceiver for receiving at a first frequency from and transmitting at a second frequency to a first satellite having at least four adjacent satellites, comprising:
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an antenna shaped to form an antenna receiving pattern including a main lobe having a null for each of the four adjacent satellites; and a phase and amplitude compensation network coupled to said antenna, said compensation network adjusting the phase and amplitude of a transmitted signal to form an antenna transmitting pattern including a main lobe having a null for each of the four adjacent satellites, wherein said antenna is shaped to include a main parabolic reflector and two side parabolic reflectors, and wherein said compensation network adjusts the phase and amplitude of a transmitted signal to the main parabolic reflector and two side parabolic reflectors. - View Dependent Claims (13)
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Specification