META 2021, META'12

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Design of a light-weight magnetic radar absorber embedded with resistive FSS
Sun Liang Kui, J. Wang, H. Cheng, Y. Zhou

Last modified: 2012-01-04

Abstract


In this letter, the design of a light-weight magnetic radar absorber (RA) having broadband bandwidth in frequency range of 1-18GHz is demonstrated. A 5mm-thick magnetic RA with weak wave absorbing performance is obtained on the basis of polyurethane foam filled with flake ferrous microwave absorbent. The use of frequency selective surfaces (FSSs) results in a significant increase of the absorbing intensity and operating bandwidth of the RA. By selecting the unit dimensions and modulating the location and square resistance of FSS, a maximal operating bandwidth with the reflectivity below -10dB can be obtained. Experimental results are presented and compared to numerical simulations, and they demonstrated that the RA embedded with lossy FSS has a super broad bandwidth of 3.19-18GHz with the reflectivity below -10dB for the double-layer case. The density of the absorber is only 0.62g/cm3, which is far more less than that of the conventional magnetic coating RAMs.