Compact dual-band resonator using anisotropic metamaterial
First Claim
1. A dual-band anisotropic metamaterial resonant apparatus, comprising:
- a plurality of spaced-apart microstrip composite right/left handed (CRLH) unit cells arranged in an array;
said array having first and second orthogonal directions;
at least two of said unit cells cascaded in the first direction; and
at least two of said unit cells cascaded in the second direction;
said array having different β
'"'"'s in orthogonal propagation directions to achieve dual-band resonance.
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Accused Products
Abstract
A dual-band resonator with compact size, such as a resonant type dual-band antenna, which uses an anisotropic metamaterial is described. The artificial anisotropic medium is implemented by employing a composite right/left-handed transmission line. The dispersion relation and the antenna physical size only depend on the composition of the unit cell and the number of cells used. By engineering the characteristics of the unit cells to be different in two orthogonal directions, the corresponding propagation constants can be controlled, thus enabling dual-band antenna resonances. In addition, the antenna dimensions can be markedly minimized by maximally reducing the unit cell size. A dual-band antenna is also described which is designed for operation at frequencies for PCS/Bluetooth applications, and which has a physical size of 1/18λ0× 1/18λ0× 1/19λ0, where λ0 is the free space wavelength at 2.37 GHz.
37 Citations
43 Claims
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1. A dual-band anisotropic metamaterial resonant apparatus, comprising:
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a plurality of spaced-apart microstrip composite right/left handed (CRLH) unit cells arranged in an array; said array having first and second orthogonal directions; at least two of said unit cells cascaded in the first direction; and at least two of said unit cells cascaded in the second direction; said array having different β
'"'"'s in orthogonal propagation directions to achieve dual-band resonance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An anisotropic metamaterial dual-band resonant apparatus, comprising:
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a first dielectric substrate layer, said first substrate layer having a surface; a metallized backplane layer; a second dielectric substrate layer between said first substrate layer and said backplane layer; and a plurality of spaced-apart microstrip composite right/left handed (CRLH) unit cells formed of metallized patches arranged in an array on the surface of said first substrate layer, each said patch having an electrical connection to said backplane layer through said second substrate layer; said array having first and second orthogonal directions; at least two of said unit cells cascaded in the first direction; at least two of said unit cells cascaded in the second direction; said array having different β
'"'"'s in orthogonal propagation directions to achieve dual-band resonance. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A dual-band anisotropic metamaterial resonant apparatus, comprising:
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a 2×
2 array of spaced-apart microstrip unit cells;said array having first and second orthogonal propagation directions; said array having different β
'"'"'s in said orthogonal propagation directions to achieve dual-band resonance. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A micro-miniature dual-band resonant device, comprising:
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an anisotropic metamaterial having at least two-dimensions in an x-y plane; a pair of composite right/left handed transmission lines (CRLH-TL'"'"'s) implemented within the same spaces of the anisotropic metamaterial but with different frequency responses in different directions within the anisotropic metamaterial; and a feed to the CRLH-TL'"'"'s providing for a first frequency of operation and a second frequency of operation with respective ones of CRLH-TL'"'"'s in said dual-band resonant device. - View Dependent Claims (28, 29, 30, 31, 32)
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33. A method of micro-miniaturization of a dual-band resonant device, comprising:
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micro-miniaturizing said device by implementing it with composite right/left handed transmission lines (CRLH-TL'"'"'s) each having different frequency responses; and imparting a multi-band functionality to said device by implementing a plurality of said CRLH-TL'"'"'s to lie in different directions within an anisotropic metamaterial. - View Dependent Claims (34, 35, 36, 37)
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38. A portable wireless device, comprising:
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a micro-miniature dual-band antenna for simultaneous operation at different first and second frequencies; a first frequency wireless transmitter or receiver coupled to the antenna for interoperation with a first-frequency wireless service; and a second frequency wireless transmitter or receiver coupled to the antenna for interoperation with a second-frequency wireless service; wherein all such components are completely disposed within a single said portable wireless device. - View Dependent Claims (39, 40, 41, 42)
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43. A portable wireless device, comprising:
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a micro-miniature dual-band antenna for simultaneous operation at different first and second frequencies; a first frequency wireless transmitter or receiver coupled to the antenna for interoperation with a first-frequency wireless service; and a second frequency wireless transmitter or receiver coupled to the antenna for interoperation with a second-frequency wireless service; wherein said antenna further comprises; an anisotropic metamaterial having two-dimensions in the x- and y-directions; a pair of composite right/left handed transmission lines (CRLH-TL'"'"'s) implemented within the same spaces of the anisotropic metamaterial but with different frequency responses in the x- and y-directions of the anisotropic metamaterial; a first feedline coupled to one of the CRLH-TL'"'"'s in said x-direction providing for a first frequency of operation; a second feedline to the other one of the CRLH-TL'"'"'s in said y-direction providing for a second frequency of operation in said dual-band antenna; wherein said first and second feedlines are separate feedlines or are the same feedlines; an array of individual constituent periodic structures disposed in the anisotropic metamaterial that together implement the CRLH-TL'"'"'s; a unit cell structure having a metal plate with a via connecting said metal plate at its center to an underlying backplane, and disposed within each of the individual constituent periodic structures, and having an equivalent circuit in which a T-bandpass circuit includes a shunt L-C circuit implemented by said via stem connection and underlying backplane, and series L-C circuits across each x- and y-direction implemented by said square metal plates and gaps between them; and a metal-insulator-metal (MIM) capacitor disposed between adjacent ones of the unit cell structures in one of the x- and y-directions only, wherein such directional asymmetry imparts correspondingly different frequency responses to each of the pair of CRLH-TL'"'"'s; wherein all such components are completely disposed within a single said portable wireless device.
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Specification