Figure 2.

Parametric dependence of the resonant mode for the low and high bands. (a) Schematic view of the structure including three long strips in a dielectric substrate and frequency dependence versus strips length (l_long) and thickness of the dielectric (thk). (b) Schematic view of the structure including a matrix of 3 × 3 short strips in a dielectric substrate and the frequency dependence versus strips length (l_short) and spacing (d_short) between the strips. (a+b) Dependence of the dual-band frequencies in the combined structure as a function of l_long and l_short: blue plot for the low frequency band, and red plot for the high frequency band. The parameters that were kept constant in all simulations were dielectric layer width and height (180 mm and 500 mm, respectively) and the distance between the strips of the same type (40 mm in the x axis). In b and a+b, the structure thickness was set to 1 cm. In the combined setup, for the plot showing the dependence of the long strips, l_short = 60 mm, and d_short = 20 mm, and for the plot for the short strips, the l_long was set to 500 mm.