Demonstration of broadband magnetic polymer composite absorber crossing S- and C-bands

In this paper, an ultra-thin microwave absorber with cross-resonator (CR) exhibiting a broad absorption bandwidth is designed and fabricated. Theoretical and experimental results show that the absorber has a wideband strong absorption in a frequency range from 2.2 to 6.8 GHz and from 2.2 to 5.4 GHz when incident electric field is y -and x -polarized, respectively. The equivalent L – C circuit and energy loss density clarify the mechanism underlying observed absorption. Moreover, the oblique incidence performance of the proposed absorber is also analyzed and shows that the broad bandwidth can be maintained as incident angle increases up to 30 degrees for y -polarized wave and 60 degrees for x -polarized wave, respectively. And when incident angle is fixed at 30 degrees the absorption bandwidth can be achieved from 2.1 to 7.5 GHz with azimuth angle of 90 degrees for x -polarized wave.