Title:
【発明の名称】ビーム形成回路網
Document Type and Number:
Japanese Patent JP2728251
Kind Code:
B2
Abstract:
A satellite communications system employs separate subsystems for providing broadcast and point-to-point two-way communications using the same assigned frequency band. The broadcast and point-to-point subsystems employ an integrated satellite antenna system which uses a common reflector (12). The point-to-point subsystem achieves increased communication capacity through the reuse of the assigned frequency band over multiple, contiguous zones (32, 34, 36, 38) covering the area of the earth to be serviced. Small aperture terminals in the zones are serviced by a plurality of high gain downlink fan beams (29) steered in the east-west direction by frequency address. A special beam-forming network (98) provides in conjunction with an array antenna (20) the multiple zone frequency address function. The satellite (10) employs a filter interconnection matrix (90) for connecting earth terminals in different zones in a manner which permits multiple reuse of the entire band of assigned frequencies. A single pool of solid state transmitters allows rain disadvantaged users to be assigned higher than normal power at minimum cost. The intermodulation products of the transmitters are geographically dispersed.
Inventors:
ROSEN HARORUDO EE
Application Number:
JP50480087A
Publication Date:
March 18, 1998
Filing Date:
July 23, 1987
Export Citation:
Assignee:
HYUUZU EAKURAFUTO CO
International Classes:
H01Q19/17; H01Q3/40; H01Q19/18; H01Q25/00; H01Q25/04; H04B7/185; H04B7/204; (IPC1-7): H01Q3/40; H01Q19/17; H01Q25/04
Domestic Patent References:
| JP6094510A |
Other References:
【文献】Ultrasonics,volume7.No.4 October,1969,P.227,P.231
Attorney, Agent or Firm:
Takehiko Suzue (2 outside)