The effects of Hsub are shown in Fig. 6d,h. Decreasing Hsub gives decreasing values for both the magnitude and phase of the S-parameters. Thinner substrates, i.e., smaller Hsub, ensure higher transmission and minimal reflection of the incident signal. From all of these reflection magnitude and transmission phase plots given in Fig. 6, the optimum values are: g1 = 1.5 mm, g2 = 0.1 mm, r1 = 1.0 mm and Hsub = 0.254 mm.