Method for controlling far field radiation from an antenna
First Claim
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1. An antenna comprising:
- a first loop defining a first enclosed area and having a first phase center point defined by the geometric center point of the first enclosed area;
a second loop coupled to the first loop and disposed substantially parallel to the first loop, the second loop defining a second enclosed area and a second phase center point defined by the geometric center point of the second enclosed area; and
a third loop coupled to the first loop and the second loop and substantially parallel to the first loop, the third loop defining a third enclosed area and a third phase center point defined by the geometric center point of the third enclosed area; and
a plurality of adjuster elements coupled to at least one of the first loop, the second loop, or the third loop to provide an adjustable loop and configured to expand or contract the enclosed area of the adjustable loop,wherein a line normal to the plane of the first loop passes through the first phase center point of the first loop, the second phase center point of the second loop, and the third phase center point of the third loop, and a current supplied to the antenna flows in a first polarity in the third loop and flows in a second polarity in the first loop and the second loop, the first and second polarities being opposite to each other wherein the plurality of adjuster elements comprises;
a first bevel gear assembly rotatably coupled to the adjustable loop and operable to expand or contract a length of a first side of the adjustable loop;
a second bevel gear assembly rotatably coupled to the adjustable loop and operable to expand or contract a length of a second side of the adjustable loop, first and second sides being opposed to each other; and
a third bevel gear assembly rotatably coupled to the first bevel gear assembly and the second bevel gear assembly and operable to expand or contract the length of the first side of the adjustable loop and the length of the second side of the adjustable loop.
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Abstract
An antenna includes a first loop defining a first enclosed area and having a first phase center point, a second loop coupled to the first loop and disposed substantially parallel to the first loop, the second loop defining a second enclosed area, and a third loop coupled to the first loop and the second loop and substantially parallel to the first loop, the third loop defining a third enclosed area with a plurality of adjuster elements coupled to at least one of the first loop, the second loop, or the third loop to provide an adjustable loop and configured to expand or contract the enclosed area of the adjustable loop.
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Citations
21 Claims
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1. An antenna comprising:
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a first loop defining a first enclosed area and having a first phase center point defined by the geometric center point of the first enclosed area; a second loop coupled to the first loop and disposed substantially parallel to the first loop, the second loop defining a second enclosed area and a second phase center point defined by the geometric center point of the second enclosed area; and a third loop coupled to the first loop and the second loop and substantially parallel to the first loop, the third loop defining a third enclosed area and a third phase center point defined by the geometric center point of the third enclosed area; and a plurality of adjuster elements coupled to at least one of the first loop, the second loop, or the third loop to provide an adjustable loop and configured to expand or contract the enclosed area of the adjustable loop, wherein a line normal to the plane of the first loop passes through the first phase center point of the first loop, the second phase center point of the second loop, and the third phase center point of the third loop, and a current supplied to the antenna flows in a first polarity in the third loop and flows in a second polarity in the first loop and the second loop, the first and second polarities being opposite to each other wherein the plurality of adjuster elements comprises; a first bevel gear assembly rotatably coupled to the adjustable loop and operable to expand or contract a length of a first side of the adjustable loop; a second bevel gear assembly rotatably coupled to the adjustable loop and operable to expand or contract a length of a second side of the adjustable loop, first and second sides being opposed to each other; and a third bevel gear assembly rotatably coupled to the first bevel gear assembly and the second bevel gear assembly and operable to expand or contract the length of the first side of the adjustable loop and the length of the second side of the adjustable loop. - View Dependent Claims (2, 3, 4)
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5. An antenna comprising:
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a first loop defining a first enclosed area and having a first phase center point defined by the geometric center point of the first enclosed area; a second loop coupled to the first loop and substantially parallel to the first loop, the second loop defining a second enclosed area and having a second phase center point defined by the geometric center point of the second enclosed area; and a first adjuster element coupled to an adjustable loop, which is the same as one of the first loop or the second loop, the first adjuster element configured to expand or contract the enclosed area of the adjustable loop, wherein a line normal to the plane of the first loop passes through the first and second phase center points, and a current supplied to the antenna is of opposite polarity in the first and second loops wherein the first adjuster element includes a plurality of adjuster elements comprising; a first bevel gear assembly rotatably coupled to the adjustable loop and operable to expand or contract a length of a first side of the adjustable loop; a second bevel gear assembly rotatably coupled to the adjustable loop and operable to expand or contract a length of a second side of the adjustable loop; and a third bevel gear assembly coupled to the first bevel gear assembly and to the second bevel gear assembly and operable to expand or contract the length of the first side of the adjustable loop and the length of the second side of the adjustable loop. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method for controlling far field radiation from an antenna having a first loop, second loop, and third loop, comprising:
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providing current of a first polarity to the first loop and the second loop and of a second polarity to the third loop, the first and second polarities being opposite to each other, adjusting an area of an adjustable loop which is the same as one of the first loop, the second loop, or the third loop to reduce a difference in a total size of a first enclosed area defined by the first loop and a second enclosed defined by the second loop and a size of a third enclosed area defined by the third loop such that the far field radiation from the first loop and the second loop is of opposite phase and equal strength to the far field radiation from the third loop to cancel far field radiation from the antenna wherein adjusting the area of the adjustable loop comprises; providing a first bevel gear assembly coupled to the adjustable loop operating to expand or contract a length of a first side of the adjustable loop; providing a second bevel gear assembly coupled to the adjustable loop operating to expand or contract a length of a second side of the adjustable loop; and rotating a third bevel gear assembly coupled to the first bevel gear assembly and to the second bevel gear assembly and operating to expand or contract the length of the first side of the adjustable loop and the length of the second side of the adjustable loop. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method for controlling far field radiation from an antenna having a first loop defining a first enclosed area and a second loop defining a second enclosed area, comprising:
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providing current of reverse polarity to both loops; and adjusting the length of an adjustable loop which is the same as one of the first or second loops to reduce a difference in a size of the first enclosed area and a size of the second enclosed area such that the far field radiation from the first loop and the second loop is of opposite phase and relatively equal strength to cancel far field radiation from the antenna wherein adjusting the length of the adjustable loop comprises; providing a first bevel gear assembly coupled to the adjustable loop operating to expand or contract a length of a first side of the adjustable loop; providing a second bevel gear assembly coupled to the adjustable loop operating to expand or contract a length of a second side of the adjustable loop; and rotating a third bevel gear assembly coupled to the first bevel gear assembly and to the second bevel gear assembly and operating to expand or contract the length of the first side of the adjustable loop and the length of the second side of the adjustable loop. - View Dependent Claims (19, 20, 21)
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Specification