Space-filling miniature antennas
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Abstract
Curves (SFC) is defined in the present invention and it is used to shape a part of an antenna. By means of this novel technique, the size of the antenna can be reduced with respect to prior art, or alternatively, given a fixed size the antenna can operate at a lower frequency with respect to a conventional antenna of the same size.
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Citations
107 Claims
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1-16. -16. (canceled)
- 17. An antenna in which at least one portion of the antenna is shaped as a space-filling curve (hereafter SFC), the SFC including at least ten connected segments, wherein said segments are each smaller than a tenth of an operating free-space wavelength of the antenna and the segments are spatially arranged such that no two adjacent and connected segments form another longer straight segment, wherein none of said segments intersect with another segment other than to form a closed loop, wherein each pair of adjacent segments forms a corner, and wherein any portion of the curve that is periodic along a fixed straight direction of space is defined by a non-periodic curve that includes at least ten connected segments in which no two adjacent and connected segments define a straight longer segment, wherein said SFC has a box-counting dimension larger than one, wherein the box-counting dimension is calculated as the slope of a straight portion of a log-log graph, wherein the straight portion is a straight segment over at least an octave of scales on the horizontal axes of the log-log graph.
- 26. An antenna in which at least one portion of the antenna is shaped as a space-filling curve (hereafter SFC), the SFC including at least ten connected segments, wherein said segments are each smaller than a tenth of the operating free-space wavelength of the antenna and the segments are spatially arranged such that no two adjacent and connected segments form another longer straight segment, wherein none of said segments intersect with another segment other than to form a closed loop, wherein each pair of adjacent segments forms a corner, and wherein any portion of the curve that is periodic along a fixed straight direction of space is defined by a non-periodic curve that includes at least ten connected segments in which no two adjacent and connected segments define a straight longer segment, wherein the antenna is a patch antenna comprising at least a conducting or superconducting ground-plane and a conducting or superconducting patch parallel to said ground-plane, in which the perimeter of the patch is shaped as a SFC.
- 51. An antenna in which at least one portion of the antenna is shaped as a space-filling curve (hereafter SFC), the SFC including at least ten connected segments, wherein said segments are each smaller than a tenth of an operating free-space wavelength of the antenna and the segments are spatially arranged such that no two adjacent and connected segments form another longer straight segment, wherein none of said segments intersect with another segment other than to form a closed loop, wherein each pair of adjacent segments forms a corner, and wherein any portion of the curve that is periodic along a fixed straight direction of space is defined by a non-periodic curve that includes at least ten connected segments in which no two adjacent and connected segments define a straight longer segment.
- 64. An antenna in which at least one portion of the antenna is shaped as a space-filling curve (hereafter SFC), wherein said SFC has a box-counting dimension larger than one, wherein the box-counting dimension is calculated as the slope of a straight portion of a log-log graph and, wherein the substantially straight portion is a straight segment over at least an octave of scales on the horizontal axes of the log-log graph.
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87. A patch antenna having at least one part shaped as a space-filling curve composed by at least ten connected segments forming a non-periodic portion of said curve, wherein:
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each of said segments is shorter than a tenth of the operating free-space wave length of the antenna;
said segments are spatially arranged in such a way that none of said segments form, together with an adjacent segment, a longer straight segment;
none of said segments intersect with another of said segments except, optionally, at the ends of the curve;
wherein, if said curve is periodic along a fixed straight direction of space, the corresponding period is defined by the non-periodic portion composed by at least ten connected segments, none of said connected segments forming, together with an adjacent segment, a straight longer segment;
and wherein said space-filling curve features a box-counting dimension larger than one;
said box-counting dimension being computed as the slope of the straight portion of a log-log graph, wherein said straight portion is substantially defined as a straight segment over at least an octave of scales on the horizontal axis of the log-log graph;
said patch antenna comprising a conducting or superconducting ground-plane and a conducting or superconducting patch, parallel to said ground-plane, the perimeter of the patch being shaped as said space-filling curve, or said patch having a slot shaped as said space-filling curve, or said patch having an aperture having a perimeter shaped as said space-filling curve. - View Dependent Claims (88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107)
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Specification