Fig. 9
The experimental absorption for the proposed ultra-broadband PMA devices when the incident angle (θ) shifted from 0 to 45° in the x-polarized and y-polarized incidences. a The experimental absorption results of the PMA sample with θ of 0°, 15°, 30°, and 45° in the x-polarized incident waves. b The experimental absorption results of the PMA sample with θ of 0°, 15°, 30° and 45° in the y-polarized incident waves