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Description
The design process of a wiremesh grating can be simplified by replacing the air-host medium by a host-porous material. Hence, the new setup allows frameless wiremeshes while preserving broadband resistance of the layers. In this work, we study a porous material with an embedded grating made of inclined wiremeshes. The proposed structure is analyzed using the effective medium approximation and performing a parametric study. The results reveal that the new setup is able to produce wider omnidirectional subwavelength absorption peak than that when hosted by air medium. The omnidirectional subwavelenth absorption is achieved for low flow resistivity porous material. Furthermore, we show that the absorption coefficient is larger when hosted by a porous material at higher frequencies.