Figure 2 shows the models of rectangular waveguides with the capacitive window or the inductive window inside and the equivalent lumped element circuits.
Through a q length of transmission line from the aperture to the capacitive window or inductive window, the equivalent source and source impedance are given by
For the case of capacitive window shown in Figure 2(a), [Z.
Figure 3 and Figure 4 show the shielding effectiveness of the enclosure with a capacitive window and an inductive window, respectively.
Figure 5 shows the shielding effectiveness of an empty enclosure and enclosures with a capacitive window or an inductive window when [d.
It can be seen from the Figure 6 that the larger the capacitive window is, the lower the resonance frequency and shielding effectiveness the enclosure has.
While Figure 9 shows that for the enclosure with a capacitive window, the resonant frequency decreases when q increases.
Figure 12 shows the equivalent circuit mode of the enclosure with an inductive window and an capacitive window.
The capacitive window lowers the resonance frequency while the inductive window enhances the resonance frequency, and the inductive window has a greater effect on the value of shielding effectiveness and resonance frequency.
In this paper, capacitive windows and inductive windows in the enclosure are considered as lumped elements, and their effects on shielding effectiveness are presented with the method of TLM.
The Effects of Capacitive Windows and Inductive Windows