ii. Equivalent Circuit
Model
The equivalent circuit for the proposed UWB notch antenna is exhibited
in figure 7. Conceptually, a microstrip feed-line is represented as a
planar transmission line with characteristic impedance of 50Ω and the
ground plane behaves as the impedance matching network. The radiating
patch with one thick slot created by a protruding stub in the square
slot and open-ended slit ring represented by a cluster of RLC
arrangement (L4-R1-C3)
and (L5-R2-C4)
respectively as shown in figure 7. Here L1 represents
the copper portion of radiating element of iteration 1or 2,
L2 represents the copper element of the protruding stub
of iteration 4 and L3 represents the inner copper
portion of the open- ended slit-ring in iteration 5 and 6.
L2, L3 and C2 connected
as a T-circuit represents the coupling of SRR.