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Ultra-broadband Microwave Absorber with P-band Absorption Based on Magnetic Material and Lumped Element

In this work, we present a composite metamaterial absorber structure which combines periodic stepped-structures of magnetic material and metallic frame structures loaded with lumped capacitors to simultaneously achieve ultra-broadband (from S- to Ku-band) and low frequency P-band resonant microwave absorption. The absorber in this work has an ultra-thin thickness of only 6.5 mm and achieves over 90% absorptivity in an ultra-broadband from 1.63 - 18 GHz with an additional designable P-band absorption peak varying from 0.528 to 1 GHz by changing the loaded capacitance. Besides, good angular stability performance is realized for all polarizations. These attractive features enable the present absorber potential prospects in many practical applications, such as in radar cross-section reduction and electromagnetic compatibility.