Miniaturized antennas based on negative permittivity materials
First Claim
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1. An apparatus comprising an antenna for operation in a range of frequencies including a resonant frequency fres of the antenna associated with a vacuum wavelength λ
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res of electromagnetic radiation, the antenna comprising;
a) at least one resonator of the kind in which a patterned structure, or a shaped material of negative electric permittivity or magnetic permeability, has maximum spatial extent less than one-half λ
res and is effective, at least at fres, for;
i) supporting a resonance, andii) coupling to an external radiation field such that the resonant scattering cross-section of the resonator is at least about 0.3λ
res2 for at least one incident polarization and direction of electromagnetic radiation; and
b) a transmission line coupled to the resonator such that when the resonator is driven at fres by a driving signal in the transmission line, such portion of the driving signal as reflects back into the transmission line does so with a return loss of at least 10 dB.
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Abstract
An antenna comprises a resonator and a waveguide. The resonator comprises at least one body having a negative effective electrical permittivity or a negative magnetic permeability when a resonance is excited therein by electromagnetic radiation lying in some portion of the microwave spectrum. A termination of the waveguide is situated adjacent the resonator. The resonator is conformed such that at the resonance, there is efficient coupling between the resonator and the waveguide.
24 Citations
17 Claims
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1. An apparatus comprising an antenna for operation in a range of frequencies including a resonant frequency fres of the antenna associated with a vacuum wavelength λ
-
res of electromagnetic radiation, the antenna comprising;
a) at least one resonator of the kind in which a patterned structure, or a shaped material of negative electric permittivity or magnetic permeability, has maximum spatial extent less than one-half λ
res and is effective, at least at fres, for;i) supporting a resonance, and ii) coupling to an external radiation field such that the resonant scattering cross-section of the resonator is at least about 0.3λ
res2 for at least one incident polarization and direction of electromagnetic radiation; andb) a transmission line coupled to the resonator such that when the resonator is driven at fres by a driving signal in the transmission line, such portion of the driving signal as reflects back into the transmission line does so with a return loss of at least 10 dB. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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res of electromagnetic radiation, the antenna comprising;
Specification