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.