A low-frequency ultra-wideband absorber based on multi-mechanism collaborative design
Aiming at the demand of low-frequency wideband electromagnetic absorption for stealth targets,a multi-mechanism synergistic method is proposed to design low-frequency ultra-wideband absorbers in the P-Ku bands by combining the loss characteristics of magnetic materials and resistive surfaces and combining the equivalent circuit model and genetic algorithm to fast perform impedance matching and parameter optimization.In this paper,we theoretically analyze the mechanism of magnetic materials in reducing the thickness of the absorber and enhancing the low-frequency absorbing performance to achieve good absorbing characteristics in P-L bands via the synergistic design of magnetic materials and resistive surfaces.Further,the absorption in S-Ku bands is compensated by using multi-layer resistive surface cascade structure to design ultra-wideband absorber within P-Ku bands.The designed low-frequency ultra-wideband absorber with a thickness of only 0.027λL(λL is the wavelength at the lowest frequency)can realize at least-8 dB and-10 dB reflection loss within 0.3～0.33 GHz and 0.33～18 GHz.In addition,the absorber has large angular stability and maintains good absorption performance under the oblique incidence for TE polarization and TM polarization.Finally,the proposed absorber was manufactured and tested.The results show that it owns low-frequency ultra-wideband absorption and wide-angle stability characteristics.
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