超宽带宽角极化不敏感的电路模拟吸波材料设计

传统的电路模拟吸波材料设计只考虑正入射时的吸波性能，当入射角较大，尤其是大于30°时，雷达吸波器的吸波效果明显恶化。随着现代双站雷达探测技术的发展，雷达探测电磁波可能来自不同的空间方向，这就要求雷达吸波材料不仅在电磁波正入射时具有较高的吸波性能，在斜入射时同样实现良好的隐身特性。为此，该文提出了一种新型的宽带吸波材料。...

Wide-angle,Ultra-wideband,and Polarization-insensitive Circuit Analog Absorbers

Most previous circuit analog absorbers only considered absorption performance under normal incidences,leading to bad absorption for large incident angles,particularly those>30°.With the advancement in modern bistatic radar detection technology,radar electromagnetic waves may come from different spatial directions,thereby necessitating radar absorbers with high absorption performance under normal and oblique incidences.Thus,in this paper,we present a novel wideband absorber comprising a conductive square-loop array embedded with lumped resistors and a well-designed Wide-Angle Impedance Matching(WAIM)layer.Results show that the WAIM layer can significantly improve absorption under oblique incidences.To make the absorber design clear and simple,an Equivalent Circuit(EC)and strict calculating formulas are proposed under normal and oblique incidences.Fractional bandwidth is increased into 137.1%through measurement under normal incidence,and the structure has a common fractional bandwidth of at least 110.5%for at least 10 dB reflection reduction when the incidence angle<45°.The similarity among EC calculated,simulated,and measured results proves the validity of the designed absorber.