Study on microwave absorbing properties of non-woven fabric coating

A fabric coating absorbing material (FCAM) with multi-layer structure was prepared on non-woven fabrics. In order to investigate absorption ability, composition (carbonyl iron power and acetylene carbon black at various ratios as absorbing agents) and structure (different multi-layer structures, including superposed directly and inserted fabrics which didn't have absorbing properties) of this absorbing material were respectively studied with 3cm wave-guide method at 9.35 GHz. Results show that this multi-layer structure together with absorbing agents has an impact on transmitting route of microwave. Moreover, the electromagnetic waves may occur repeatedly energy dissipation through a series of dispersion, reflection in the multi-layers. As a result, resonance loss may be occurred. Because fabrics used were very light, this FCAM had a lower planar density.