EP 0427201 A2 19910515 - Satellite beam-forming network system having improved beam shaping.
Title (en)
Satellite beam-forming network system having improved beam shaping.
Title (de)
Satelliten-Strahlsteuerungssystem mit verbesserter Strahlformung.
Title (fr)
Système de commande de faisceau pour satellite avec formation de faisceau améliorée.
Publication
Application
Priority
US 43405989 A 19891108
Abstract (en)
A steerable beam antenna system (24) for use in satellite communication systems and including a main reflector (32) and an antenna array having a plurality of feed elements (50) is disclosed. Additional feed elements (314, 316) are positioned along with the array (116-119) and are used to cancel undesirable side lobes which appear as the beam is steered towards the end portions of a target area (324, 330). The antenna array is positionable at or near at least one focal point of the main reflector (48), and its feed elements can receive microwaves from or transmit microwaves toward the main reflector. A Butler matrix (110) having multiple input ports (310) and multiple outputs (312) is connected to the array of feed elements and substantially performs a spatial discrete Fourier transformation on a generated set of signals to be transmitted which have a predetermined phase relationship between the signals, which is necessary to create the steerable beam. The Butler matrix also can perform an inverse spatial transformation on a set of incoming signals focused on the array by the reflector and received by the feed elements.
IPC 1-7
IPC 8 full level
H01Q 19/17 (2006.01); H01Q 3/26 (2006.01); H01Q 3/40 (2006.01); H01Q 25/00 (2006.01)
CPC (source: EP)
H01Q 3/2629 (2013.01); H01Q 3/40 (2013.01); H01Q 25/007 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0427201 A2 19910515; EP 0427201 A3 19911211; EP 0427201 B1 19950830; AU 624742 B2 19920618; AU 6476590 A 19910516; CA 2027456 A1 19910509; CA 2027456 C 19950926; DE 69021993 D1 19951005; DE 69021993 T2 19960222; JP H03172003 A 19910725
DOCDB simple family (application)
EP 90121219 A 19901106; AU 6476590 A 19901017; CA 2027456 A 19901012; DE 69021993 T 19901106; JP 30375190 A 19901108