Table 4: Equivalent circuit and geometrical parameters calculated by the curve-fitting method.

θR (Ω)C (pF)lloop (mm)lslot (mm)D (mm)

95.010.486.37.98.9
45° TE75.000.506.78.39.7
45° TM73.820.546.37.68.5
Averaged values81.280.516.47.99.0
Values after HFSS optimization70.000.506.07.99.0