Frequency-Selective Rasorber with Tri-resonant Absorption Band

In this paper, a rasorber with broadband absorption response is presented. The absorption band is located below the transmission window, and a good absorptivity is achieved. Cross-frame and cross-slot FSSs are employed to fulfill the desired rasorber performance. Tri-resonant behavior is obtained by the lossy cross-frame array and used to consume the wide-band incident power. Furthermore, a stable absorption performance is achieved until 50° incident angle. The current distribution and simulated results are given to illustrate the operating mechanism of the presented design.