Broadside high-directivity microstrip patch antennas
First Claim
1. A high-directivity microstrip patch antenna comprising:
- a driven patch and at least one parasitic patch coupled to said driven patch by means of a gap;
the driven and the at least one parasitic patches being placed on a common plane defined by a dielectric substrate;
wherein the driven patch and the at least one parasitic patch operate at a resonant frequency of the antenna that is larger than the antenna'"'"'s fundamental resonant frequency the operating resonant frequency being determined by the shape and dimensions of said gap for a given size of driven patch and the least one parasitic patch,the gap between the driven patch and the at least one parasitic patch being defined by a space-filling curve, said space-filling curve being a curve comprising at least ten connected segments, wherein each of said segments forms an angle with its neighbors so that no pair of adjacent segments define a larger straight segment, and wherein any portion of the curve that is periodic along a fixed straight direction of space is defined by a non-periodic curve comprising at least ten connected segments in which no pair of adjacent and connected segments define a straight longer segment;
wherein the microstrip patch antenna has a broadside radiation pattern at the operating resonant frequency; and
wherein the microstrip patch antenna has a directivity larger at the operating resonant frequency than at the fundamental resonant frequency.
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Accused Products
Abstract
High-directivity microstrip antennas comprising a driven patch and at least one parasitic element placed on the same plane, operate at a frequency larger than the fundamental mode of the driven patch in order to obtain a resonant frequency with a high-directivity broadside radiation pattern. The driven patch, the parasitic elements and the gaps between them may be shaped as multilevel and/or Space Filling geometries. The gap defined between the driven and parasitic patches according to the invention is used to control the resonant frequency where the high-directivity behaviour is obtained. The invention provides that with one single element is possible to obtain the same directivity than an array of microstrip antennas operating at the fundamental mode.
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Citations
28 Claims
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1. A high-directivity microstrip patch antenna comprising:
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a driven patch and at least one parasitic patch coupled to said driven patch by means of a gap; the driven and the at least one parasitic patches being placed on a common plane defined by a dielectric substrate; wherein the driven patch and the at least one parasitic patch operate at a resonant frequency of the antenna that is larger than the antenna'"'"'s fundamental resonant frequency the operating resonant frequency being determined by the shape and dimensions of said gap for a given size of driven patch and the least one parasitic patch, the gap between the driven patch and the at least one parasitic patch being defined by a space-filling curve, said space-filling curve being a curve comprising at least ten connected segments, wherein each of said segments forms an angle with its neighbors so that no pair of adjacent segments define a larger straight segment, and wherein any portion of the curve that is periodic along a fixed straight direction of space is defined by a non-periodic curve comprising at least ten connected segments in which no pair of adjacent and connected segments define a straight longer segment; wherein the microstrip patch antenna has a broadside radiation pattern at the operating resonant frequency; and wherein the microstrip patch antenna has a directivity larger at the operating resonant frequency than at the fundamental resonant frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 14)
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9. A method of operating a high-directivity microstrip patch antenna, the antenna comprising a driven patch and at least one parasitic patch coupled to said driven patch by means of a gap, the driven patch and the at least one parasitic patches being placed on a common plane defined by a dielectric substrate, the method comprising;
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operating the driven patch and the at least one parasitic patches at a resonant frequency of the antenna that is larger than the antenna'"'"'s fundamental resonant frequency, the operating resonant frequency being determined by the shape and dimensions of said gap for a given size of the driven patch and at least one parasitic patch; the gap between the driven patch and the at least one parasitic patch being defined by a space-filling curve, said space-filling curve being a curve comprising at least ten connected segments, wherein each of said segments forms an angle with its neighbors so that no pair of adjacent segments define a larger straight segment, and wherein any portion of the curve that is periodic along a fixed straight direction of space is defined by a non-periodic curve comprising at least ten connected segments in which no pair of adjacent and connected segments define a straight longer segment; wherein the microstrip patch antenna has a broadside radiation pattern at the operating resonant frequency; and wherein the microstrip patch antenna has a directivity larger at the operating resonant frequency than at the resonant fundamental frequency. - View Dependent Claims (10, 11, 12)
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13. A microstrip patch antenna comprising:
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a driven patch and at least one parasitic patch; the driven patch and the at least one parasitic patch being placed on a same plane defined by a dielectric substrate; the at least one parasitic patch being coupled to the driven patch by means of a gap between the driven patch and the at least one parasitic patch; and the gap being defined by a space-filling curve, said space-filling curve being a curve comprising at least ten connected segments, wherein each of said segments forms an angle with its neighbors so that no pair of adjacent segments define a larger straight segment, and wherein any portion of the curve that is periodic along a fixed straight direction of space is defined by a non-periodic curve comprising at least ten connected segments in which no pair of adjacent and connected segments define a straight longer segment.
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15. A high-directivity microstrip patch antenna comprising:
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a driven patch and at least one parasitic patch coupled to said driven patch by means of a gap; the driven patch and the at least one parasitic patch being placed on a same plane defined by a dielectric substrate; wherein the driven patch and the at least one parasitic patch operate at a resonant frequency of the antenna that is larger than the antenna'"'"'s fundamental resonant frequency; the operating resonant frequency being determined by the shape and dimensions of said gap for given sizes of driven patch and parasitic patch; the gap between the driven patch and the at least one parasitic patch having a width smaller than approximately 1/150 of the wavelength of the antenna'"'"'s fundamental resonant frequency; at least a part of the driven patch and at least a part of the parasitic patch or patches being defined by at least one of a space-filling curve and a multilevel structure; the microstrip patch antenna having a broadside radiation pattern at the operating resonant frequency; and the microstrip patch antenna having a directivity larger at the operating resonant frequency than at the fundamental resonant frequency. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of operating a high-directivity microstrip patch antenna, the antenna comprising a driven patch and at least one parasitic patch coupled to said driven patch by means of a gap, and the driven patch and the at least one parasitic patch being placed on a common plane defined by a dielectric substrate, the method comprising:
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operating the driven patch and the at least one parasitic patch at a resonant frequency of the antenna that is larger than the antenna'"'"'s fundamental resonant frequency; the operating resonant frequency being determined by the shape and dimensions of said gap for given sizes of driven patch and parasitic patch; the gap between the driven patch and the at least one parasitic patch having a width smaller than approximately a one-hundred-fiftieth of the wavelength corresponding to the fundamental resonant frequency; at least a part of the driven patch and at least a part of the parasitic patch or patches being defined by at least one of a space-filling curve and a multilevel structure; wherein the microstrip patch antenna has a broadside radiation pattern at the operating resonant frequency; and the microstrip patch antenna has a directivity larger at the operating resonant frequency than at the fundamental resonant frequency. - View Dependent Claims (25, 26, 27, 28)
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Specification