Section IV: New DGS Filter
Communication systems require not only band-stop frequencies but
band-pass frequencies for efficient communication. To understand
band-stop and band-pass characteristics of a DGS filter system, an
H-shaped DGS has been presented. The defect in the ground plane is shown
in Fig. 11. This defect in the ground plane perturbs the 50 \(\Omega\)microstrip transmission line on the top plane to give rise to a
stop-band frequency as done earlier, with the semi-h defect. After
designing the initial band-stop filter, we introduce a gap in the 50\(\Omega\) microstrip feed line in the top plane. Another SMD capacitor
is mounted in that gap, which allows the control of the pass band
resonant frequency. The top plane view is depicted in Fig. 12. All the
marked parameters to help replicate the work done is given in Table IV.
Figure 11: Ground plane with H-shaped DGS
Figure 12: Top plane with a 50 \(\Omega\) feed line and a coupling gap
Table IV: Parameters for Band-Pass
Filter Design