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(Color online) Design and fabrication of a microwave ultra-broadband MA. (a) Three-dimensional illustration of the simulated MA, (b) schematic of a MA unit cell, and (c) photograph of the fabricated sample. The optimized dimensions of a unit are Wt = 5 mm, Wl = 9 mm, P = 11 mm, tm = 0.05 mm, td = 0.2 mm, and T = 5 mm. Subscript “m” represents copper, and “d” for FR4.
(Color online) Simulated and experimental absorption performance of the MA in Fig. 1. (a) Numerical simulation: absorption (blue line, near one at 10 GHz), reflection (red line, near zero at 10 GHz), and transmission (green line, negligible). (b) Comparison between the simulated absorption (blue line, smooth) and experimental absorption (red line). Inset in (b) shows the configuration of the incident wave.
(Color online) Simulated electric and magnetic amplitude distributions on the central cross section of a unit cell at some frequencies. (a), (c), (e), and (g) are for the electric amplitude at 8.3 GHz, 10 GHz, 12 GHz, and 14 GHz, respectively. (b), (d), (f), and (h) are for the magnetic amplitude at 8.3 GHz, 10 GHz, 12 GHz, and 14 GHz, respectively.
(Color online) Mechanism of ultra-broadband absorption. (a) A periodic metal-dielectric structure. (b) Dispersion curves of the structure in (a) for px = py = 11 mm and pz = 0.25 mm with different width w from 5 to 9mm. Only the lowest energy band is shown.
(Color online) Influence of some structure parameters on the absorption and angular dispersion of absorption. (a) Simulated absorption when the top width of the pyramids in Fig. 1(a) changes from 4 mm to 6 mm with the other parameters fixed. (b) Simulated absorption when the number of the composite layers of the pyramids in Fig. 1(a) changes with the other parameters fixed. Simulated (c) and experimental (d) angular absorptions of the MA in Fig. 1 for TE configuration. The incident angle is varied from 10° to 60° in a step of 10° in the experiment and changed from 0° to 60° in the simulation.
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