3-D Frequency-Selective Rasorber Based on Magnetic Material and Meander Line

This communication presents a magnetic-material-loaded 3-D frequency-selective rasorber (FSR) consisting of independent transmission and absorption channels. The main feature of the proposed design is employing both ferrite material and meander line in the absorption channel to obtain a wide absorption band and low-loss transmission band. Detailed analysis of the absorption channel is given with the help of equivalent circuit models to demonstrate the operating principle. The design guidelines are formulated, and a design example is presented with both the simulated and measured results. The proposed FSR features both thin thickness and wide absorption bands. Moreover, no lumped components are required, which greatly facilitates the fabrication and reduces the cost.