Title:
PHASED ARRAY ANTENNA CALIBRATION SYSTEM AND METHOD USING ARRAY CLUSTERS
Document Type and Number:
WIPO Patent Application WO1999054960
Kind Code:
A3
Abstract:
Apparatus and method for self-contained calibration and failure detection in a phased array antenna having a beamforming network. The beamforming network includes a plurality of array ports and a plurality of beam ports or a space fed system. A plurality of antenna elements and a plurality of transmit/receive modules are included. Each one of the modules is coupled between a corresponding one of the antenna elements and a corresponding one of the array ports. A calibration system is provided having: an RF input port; an RF detector port; an RF detector coupled to the RF detector port; and an antenna element port. A switch section is included for sequentially coupling each one of the antenna elements through the beam forming/space-fed network and the one of the transmit/receive modules coupled thereto selectively to either: (a) the detector port during a receive calibration mode; or, (b) to the RF input port during a transmit calibration mode. The switch section includes a switch for selectively coupling a predetermined one of the antenna elements, i.e., a calibration antenna element, selectively to either: (a) the RF test input of the calibration system during the receive calibration mode through a path isolated from the beamforming network; or, (b) to the detector port during the transmit calibration mode through a path isolated from the beamforming network. In one embodiment, the calibration antenna element is disposed in a peripheral region of the array of antenna elements. In another embodiment, the array of antenna elements is arranged in clusters, each one of the clusters having a calibration antenna element.
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Inventors:
SIKINA THOMAS V
BEDIGIAN OSCAR J
SCHUSS JACK J
BEDIGIAN OSCAR J
SCHUSS JACK J
Application Number:
PCT/US1999/005502
Publication Date:
January 06, 2000
Filing Date:
March 12, 1999
Export Citation:
Assignee:
RAYTHEON CO (US)
International Classes:
H01Q21/24; G01S7/02; G01S7/40; H01Q3/26; H04B17/00; (IPC1-7): H01Q3/26; H01Q21/00
Foreign References:
| US5086302A | 1992-02-04 | |||
| US5412414A | 1995-05-02 | |||
| US4949090A | 1990-08-14 | |||
| US5657023A | 1997-08-12 | |||
| US5867123A | 1999-02-02 |
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