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Three-dimensional H-fractal bandgap materials and antennas

Authors Wen, Wei-Jia
Sheng, Ping
Hou, Bo
Issue Date 2009-01-27
Source US Patent , 7,482,994 B2, 2009
Summary Photonic band gap (PBG) materials are those periodic composites that possess spectral gaps in the frequency spectrum, in which electromagnetic waves cannot propagate in any direction within the material. Conventional PBG are based on Bragg scattering which limits the size of PBG structures for low-frequency applications. This invention relates to novel three-dimensional (3D) band gap composite material having band gap properties and in particular to such materials in which at least one of the components is formed with 3D H-fractal configurations. 3D fractal can shield much longer electromagnetic (EM) wavelength to generate sub-wavelength stop band gaps with much smaller structure dimension due to its much longer metallic line compared to 1D or 2D structures. By injecting high-frequency current into the 3D H-fractal, microwave radiation can be obtained at frequency much lower than the dipole or planar H-fractal antennas. Thus, it can be used for constructing the sub-wavelength antennas with high efficiency. The radiating frequency can be further lowered when the metallic 3D fractal is embedded in a high dielectric constant material. The invention can be widely used in telecommunication area such as sub-wavelength shielding of EM wave. RF and microwave radiation device such as GPS and wireless communication system, etc.
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Language English
Format Patent
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