UHF Metamaterial Absorber with Small-Size Unit Cell by Combining Fractal and Coupling Lines

Figure 5

(a) Square ring: a = 10 mm and b = 9 mm. (b) Fractal: a = 10 mm, b = 9 mm, c = 2.6 mm, and d = 2.5 mm. (c) More compact: a = 9.4 mm and b = 9 mm. (d) Compact fractal: a = 10 mm, b = 8 mm, c = 2 mm, and d = 1.8 mm. (e) Loaded interdigital capacitors: a = 10 mm, b = 9 mm, and g = 0.1 mm. The line width for all is 0.1 mm.

(a)

(b)

(c)

(d)

(e)