Extendable/retractable antenna calibration element
First Claim
Patent Images
1. An antenna arrangement, comprising:
- a conductive ground sheet defining at least a first broad side;
a principal antenna for at least one of transmitting and receiving, said principal antenna arrangement coacting with said conductive ground sheet for transducing electromagnetic signals flowing in space in that half-space adjacent said first broad side of said ground sheet, said principal antenna including at least one principal antenna port;
a retractable-extensible calibration radiation element capable of extending through at least said first broad side of said ground sheet, and also being capable of assuming (a) a retracted position in which said calibration radiation element does not extend into said half-space and (b) an extended position in which said calibration radiation element extends from said first side of said ground sheet into said half-space; and
a calibration antenna port associated with said calibration radiation element.
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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.
32 Citations
17 Claims
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1. An antenna arrangement, comprising:
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a conductive ground sheet defining at least a first broad side; a principal antenna for at least one of transmitting and receiving, said principal antenna arrangement coacting with said conductive ground sheet for transducing electromagnetic signals flowing in space in that half-space adjacent said first broad side of said ground sheet, said principal antenna including at least one principal antenna port; a retractable-extensible calibration radiation element capable of extending through at least said first broad side of said ground sheet, and also being capable of assuming (a) a retracted position in which said calibration radiation element does not extend into said half-space and (b) an extended position in which said calibration radiation element extends from said first side of said ground sheet into said half-space; and a calibration antenna port associated with said calibration radiation element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An antenna arrangement, comprising:
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a conductive ground sheet defining at least a first broad side; a principal antenna for at least one of transmitting and receiving, said principal antenna arrangement coacting with said conductive ground sheet for transducing electromagnetic signals flowing in space in that half-space adjacent said first broad side of said ground sheet, said principal antenna including at least one principal antenna port; a retractable-extensible monopole calibration element capable of extending through at least said first broad side of said ground sheet, and also being capable of assuming (a) a retracted position in which said calibration element does not extend into said half-space and (b) an extended position in which said calibration element extends from said first broad side of said ground sheet into said half-space; and a calibration antenna port associated with said calibration element.
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Specification