Method and apparatus for reducing earth station interference from non-GSO and terrestrial sources
AssigneeHughes Electronics Corporation
InventorsJoseph Santoru, Ernest C. Chen
Life of this patent
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Abstract
An apparatus for reducing earth station interference in a receiver antenna from non-GSO and terrestrial sources is disclosed. The apparatus comprises an absorber coupled to a receiver antenna feed assembly disposed between the non-GSO or terrestrial source and the feed assembly. Embodiments are disclosed in which the absorber is strategically placed where it minimally affects the receiver antenna mainlobe performance, while reducing interference from non-GSO and terrestrial sources.
Claims36
An antenna for receiving electromagnetic energy from a first transmitter and substantially rejecting electromagnetic energy from a second transmitter spatially diverse from the first transmitter, comprising:
- a reflector having a reflecting surface for reflecting and focusing the electromagnetic energy from the first transmitter to at least one focal point;
- a feed assembly for receiving the reflected electromagnetic energy, the feed assembly having a sensitive axis facing the reflecting surface wherein the feed assembly and the reflector together define a spillover region bounded by a feed assembly beamwidth extending from the sensitive axis at least partially beyond the reflector surface;
- and
- an electromagnetic energy absorber, attached to the feed assembly and disposed at least partially between the spillover region and the feed assembly.
An antenna for receiving electromagnetic energy from a first transmitter and substantially rejecting electromagnetic energy from a second transmitter spatially diverse from the first transmitter, comprising:
- a reflector having a reflecting surface for reflecting and focusing the electromagnetic energy from the first transmitter to at least one focal point;
- a receiving means for receiving the reflected electromagnetic energy, the receiving means disposed proximate the at least one focal point and having a sensitive axis facing the reflecting surface wherein the receiving means and the reflector together define a spillover region bounded by a receiving means beamwidth extending from the sensitive axis at least partially beyond the reflector surface;
- and
- an electromagnetic energy absorbing means, attached to the receiving means and disposed at least partially between the spillover region and the receiving means.
A method of receiving electromagnetic energy from a first transmitter and substantially rejecting electromagnetic energy from a second transmitter spatially diverse from the first transmitter, comprising the steps of:
- receiving electromagnetic energy from the first transmitter reflected by a reflector surface in a feed assembly, the feed assembly and reflective surface together defining a spillover region defined by a feed assembly beamwidth extending from a feed assembly sensitive axis at least partially beyond the reflector surface;
- and
- absorbing the electromagnetic energy from the second transmitter with an absorber coupled to the feed assembly and disposed at least partially between the spillover region and the feed assembly.
An antenna for receiving electromagnetic energy, comprising:
- an reflector;
- a feed assembly for receiving electromagnetic energy reflected by the reflector;
- wherein the antenna includes a gain characteristic having posterior-side lobes formed by a feed assembly beamwidth extending from the feed assembly sensitive axis beyond the reflecting surface;
- and
- an electromagnetic energy absorber, attached to the feed assembly, for attenuating the electromagnetic energy received via the posterior side lobes.
An antenna for receiving electromagnetic energy from a first transmitter on a first side of the antenna and substantially rejecting electromagnetic energy from a second transmitter on a second side of the antenna, comprising:
- a reflector having a reflecting surface for reflecting and focusing the electromagnetic energy from the first transmitter;
- a feed assembly for receiving the reflected and focused electromagnetic energy, the feed assembly having a sensitive axis facing the reflecting surface;
- wherein the feed assembly and the reflector together define a spillover region in which the feed assembly is exposed to electromagnetic energy from the second transmitter disposed on the second side of the reflector;
- and
- an electromagnetic energy absorber, attached to the feed assembly, the absorber for attenuating electromagnetic energy from the second transmitter in the spillover region.
Dependencies are inferred from the claim text.