A New Ultracompact Narrow Bandpass Microstrip Filter Using Double-Negative Quasiplanar Cells

Figure 4

(a) The scattering parameters of the DNG cell, and (b) the electric field distribution over the cross section of the multilayer printed circuit board (at the middle of the structure) at 1 GHz, where the parameters indicated in Figure 1(a) are set as, a = 12.9 mm,  = 4.3 mm, Ws = 5.5 mm, Cl = 10 mm, Cw = 11.4 mm, Cd = 1.4 mm, gs = 0.2 mm, and h = 0.8 mm.

(a)

(b)