Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1997-08-08
1999-02-23
Tarcza, Thomas
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342372, 342373, 342374, H01Q 322
Patent
active
058749152
ABSTRACT:
A wideband electronically scanned cylindrical array includes an array of end-fire radiating elements, the elements arranged in a first plurality of columns, the columns arranged radially about a center axis of the array. A beamforming network is connected to the array of radiating elements. The beamforming network includes a power divider circuit for dividing an input RF drive signal into a second plurality of drive signals, and a matrix of electronically controlled transfer switches. A true time delay network comprising a third plurality of delay lines couples respective ones of the drive signals to the matrix of transfer switches. A third plurality of transmit amplifiers is coupled to the matrix of transfer switches, each amplifier for amplifying a respective one of the drive signals. The beamforming network further includes apparatus for coupling the amplified drive signals to selected ones of the columns of radiating elements. A beamforming controller is connected to the coupling apparatus and the matrix of transfer switches for selecting sectors of the columns of radiating elements to be driven by the drive signals to form a desired beam. The columns of radiating elements are arranged in a circularly symmetric fashion about the axis in the disclosed embodiment.
REFERENCES:
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patent: 5012254 (1991-04-01), Thompson
patent: 5132694 (1992-07-01), Sreenivas
patent: 5414433 (1995-05-01), Chang
patent: 5428364 (1995-06-01), Lee et al.
patent: 5583516 (1996-12-01), Lembo
Chu Ruey S.
Lee Jar J.
Schaffer Kenneth L.
Alkov Leonard A.
Lenzen, Jr. Glenn H.
Phan Dac L.
Raytheon Company
Tarcza Thomas
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