Substrate material used Dielectric constant () Thickness between ground and lower patch (h1) Thickness between lower and parasitic patch (h2) Length of the fed patch (L) Width of the fed patch (W) Depth of the notch (wn) Width of the notch (S) Length of the first U slot (Ls) Width of the first U slot (s) Base width of first U-slot (ws) Length of the second U slot (Ls) Width of the second U slot (s) Base width of second U-slot (ws) Feed location (x0, y0) Length of the parasitic patch (L2) Width of the parasitic patch (W2) | FR4 4.4 1.6 mm 1.6 mm 39.25 mm 29.25 mm 4 mm 15 mm 15.7 mm 1.0 mm 10.3 mm 15.7 mm 1.0 mm 10.3 mm (−0.275, −4.37 mm) 39.25 mm 29.25 mm |