Three-dimensional H-fractal bandgap materials and antennas
First Claim
1. A three-dimensional (3D) bandgap material comprising a three-dimensional fractal structure, tuned to define at least one predetermined transmission bandgap, wherein the fractal structure is formed by subjecting a mother element to a repeated affine transformation through the whole three dimensions, with the rule that each line segment be perpendicular to the plane formed by the two lower-level lines.
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Abstract
A three dimensional (3D) fractal structure with H as the mother element is hereby disclosed. Such a 3D structure can act as selective total microwave reflectors or selective microwave filters in transmission. When excited through current injection, such a 3D fractal structure can act as highly efficient antenna for radiating or detecting pre-determined microwaves, with the relevant wavelength much larger than the size of the radiation or detection structure.
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Citations
22 Claims
- 1. A three-dimensional (3D) bandgap material comprising a three-dimensional fractal structure, tuned to define at least one predetermined transmission bandgap, wherein the fractal structure is formed by subjecting a mother element to a repeated affine transformation through the whole three dimensions, with the rule that each line segment be perpendicular to the plane formed by the two lower-level lines.
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11. A three-dimensional (3D) bandgap material comprising a three-dimensional fractal structure, tuned to define at least one predetermined transmission bandgap, wherein the fractal structure is formed by subjecting a mother element to a repeated affine transformation through the whole three dimensions, with the rule that each line segment be perpendicular to the plane formed by the two lower-level lines, and wherein said mother element is an H-shape and said transformation comprises scaling.
- 12. A method of forming a bandgap composite material comprising the step of forming a 3D H-fractal structure with a mother element whose dimensions and number of levels are selected to define at least one predetermined bandgap for said composite material.
- 14. A three-dimensional fractal antenna comprising a three-dimensional conductive fractal structure, wherein the fractal structure is formed by subjecting a mother element to a repeated affine transformation through the whole three dimensions, with the rule that each line segment be perpendicular to the plane formed by the two lower-level lines.
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20. A three-dimensional fractal antenna comprising a three-dimensional conductive fractal structure, wherein the fractal structure is formed by subjecting a mother element to a repeated affine transformation through the whole three dimensions, with the rule that each line segment be perpendicular to the plane formed by the two lower-level lines, and wherein said mother element is an H-shape and said transformation comprises scaling.
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21. A three-dimensional (3D) bandgap material comprising:
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a three-dimensional fractal structure, tuned to define at least one predetermined transmission bandgap; and a conducting three-dimensional H-fractal pattern formed with at least one bandgap at a wavelength that is larger than all the dimensions of the said material.
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22. A three-dimensional (3D) bandgap material comprising:
a three-dimensional fractal structure, tuned to define at least one predetermined transmission bandgap, wherein said fractal structure is defined by dielectric materials forming a 3D H-fractal pattern embedded in a conducting material which has at least one bandgap at a wavelength that is larger than all the dimensions of the said material.
Specification