Extendable/retractable antenna calibration element

Details Extendable/retractable antenna calibration element Extendable/retractable antenna calibration element

2007-05-08

2007-05-08

Phan, Tho (Department: 2821)

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

C343S7000MS, C342S174000, C342S368000

Reexamination Certificate

active

11219978

ABSTRACT:
An antenna array coacts with a ground plane for radiation. Calibration of the array is accomplished with the aid of one or more extensible calibration antenna elements, such as monopole antenna elements. Each calibration monopole is ordinarily retracted below the ground plane and is not “energized.” When calibration is desired, it is extended to protrude above the ground plane so as to achieve mutual coupling with one or more of the elements of the array antenna. Calibration signals may be passed in either direction. The calibration antenna may be extended/retracted by vacuum, mechanical device, or electrical motor.

REFERENCES:
patent: 5248982 (1993-09-01), Reinhardt et al.
patent: 5477229 (1995-12-01), Caille et al.
patent: 6157343 (2000-12-01), Andersson et al.
patent: 6636173 (2003-10-01), Graham
patent: 6771216 (2004-08-01), Patel et al.
patent: 7132979 (2006-11-01), Langenberg

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