Space-filling miniature antennas
First Claim
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1. An apparatus comprising:
- a single antenna having a surface that radiates and receives electromagnetic waves, an entirety of an edge enclosing the surface shaped as a substantially non-periodic curve;
the non-periodic curve has a box counting dimension larger than one with the box-counting dimension computed as the slope of a substantially straight portion of a line in a log-log graph over at least one octave of scales on a horizontal axis of the log-log graph; and
the single antenna functions across each of at least two cellular telephone system frequency bands.
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Abstract
A novel geometry, the geometry of Space-Filling 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.
262 Citations
26 Claims
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1. An apparatus comprising:
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a single antenna having a surface that radiates and receives electromagnetic waves, an entirety of an edge enclosing the surface shaped as a substantially non-periodic curve; the non-periodic curve has a box counting dimension larger than one with the box-counting dimension computed as the slope of a substantially straight portion of a line in a log-log graph over at least one octave of scales on a horizontal axis of the log-log graph; and the single antenna functions across each of at least two cellular telephone system frequency bands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A single antenna, comprising:
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a single radiating element having a perimeter of which is defined by a multi-segment, irregular curve, each of said segments being spatially arranged such that no two adjacent and connected segments form another longer straight segment and none of said segments intersects with another segment other than at the beginning and at the end of said multi-segment, irregular curve to form a closed loop; a matching network between the single radiating element and an input connector or transmission line; the single antenna simultaneously receives electromagnetic waves of at least a first and a second operating wavelength and radiates at multiple operating wavelengths; the first of the operating wavelengths corresponds to an operating wavelength within a first frequency band of a first cellular telephone system; the second of the operating wavelengths corresponds to an operating wavelength within a second frequency band of a second cellular telephone system; the first and second frequency bands being non-overlapping; and each segment of the multi-segment, irregular curve is shorter than one tenth of at least one operating free space wavelength of the antenna. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification