Sijia Li, Xiangyu Cao, Jun Gao, Yi Zhao, Zhao Zhang
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Fractal MA and for in-band RCS reduction of array antennas
To miniaturize the perfect metamaterial absorber, a fractal three-order oblique cross dipole slot structure is proposed and investigated. The fractal perfect metamaterial absorber (FPMA) consists of two metallic layers separated by a lossy dielectric substrate. The top layer etched a three-order oblique fractal-shaped cross dipole slot set in a square patch and the bottom one is a solid metal. A prototype with a thickness of 0.0106λ (λ is the wavelength at 3.18GHz) of the FPMA is designed, fabricated, measured, and is loaded on a 1×10 guidewave slot array antennas to reduce the in-band radar cross section (RCS). Experiments are carried out to verify the simulation results, and the experimental results show that the absorption at normal incidence is above 90% from 3.17 to 3.22GHz, and the array antennas significantly obtain the RCS reduction without the radiation deterioration.
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