Deformation-stable dual band flexible antenna based on negative permeability metamaterials
To address the adverse effect of mechanical deformation on its electromagnetic characteristics, a flexible antenna was designed with stable performance under deformation. Dual frequency bands were excited at 2. 45 GHz and 5. 80 GHz by loading the metamaterial with negative permeability. The mechanism and affecting factors were analyzed on the excited frequency bands based upon the negative permeability of the metamaterial. The coupling effect was studied between the electromagnetic and mechanical field. The size is 0. 24λ0 ×0. 20λ0 for the flexible dual band antenna, and the thickness is only 0. 001λ0 , where λ0 is the wavelength of the electromagnetic wave in free space at 2. 45 GHz. The experimental results show that the electromagnetic characteristics of the flexible antenna remain stable at bending radius R from 10 mm to 50 mm. The metamaterial loaded flexible antenna can independently introduce new band, and the electromagnetic characteristics remain stable under certain degree of mechanical deformation. The design method meets the requirement of ultra-thin and miniaturized flexible antenna.
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维普
