Flexible and lightweight organic metamaterial for broadband microwave absorbing application
Résumé
This work deals with the use of periodic structures, composed of silicone foam loaded with long carbon fibers (12 mm), for the elaboration of microwave absorber. This absorber, which can be considered as an organic metamaterial absorber, is made using two simple manufacturing concepts: a very simple elaboration method of the flexible silicone foam composite and a simple periodic structuring of the absorber. The proposed absorber presents low density (0.33 g.cm -3 ) and broadband absorption performance (reflectivity below −10 dB) between 4 and 18 GHz, for normal (0°) and oblique (30°) incidences of electromagnetic waves, with a thickness of only 16 mm.