Figure 7 Comparative plot of simulated and measured reflection coefficient (S11/S22)
Figure 8 shows the variation of simulated and measured and transmission coefficient (S21/S12) with respect to the frequency. Isolation is a positive quantity and can be calculated using Equation (14).
\(Isolation=-10\log_{10}\left|S_{21}\right|^{2}\) (14)
A good port-to-port isolation (S21/S12 ≤ -16.8 dB (simulated) and S21/S12 ≤ -19.3 dB (measured)) is achieved for the entire operational band from 4.395-10.184 GHz.