An Ultra-Broadband Metamaterial Absorber Design for Large Angle Oblique Incidence

In this letter, a metamaterial absorber (MA) with air cavity loaded with four lumped resistors is proposed and realized for ultra-broadband absorption of transverse electric (TE) polarization mode at large angle of oblique incidence. In order to realize the steady absorption at the large angle range from 50° to 70°, the optimal optimized angle is 62° through the impedance matching formula, and the parameters of the metamaterial absorber are optimized at this angle. The simulation results indicate that all absorption bands of TE mode over 90% in the angle of 50° to 70° are maintained above 9 to 15 GHz and the relative bandwidths are more than 60%, where the maximum and the minimum values are 69.07% and 61.65%, respectively.