Equivalent capacitances of coplanar waveguide discontinuities and interdigitated capacitors using a three-dimensional finite difference method

CAD modeling of coplanar waveguide interdigital capacitor

“…Regarding C 2 , the results presented in [15] show that for odd N, C 1 is almost double C 2 . Thus, in our circuit model, it will be assumed that C 2 ϭ C 1 /2 for odd N.…”

“…The second comparison was made with the results presented in [15], in which the quasi-static FDM was used to obtain the series capacitance C s along with the shunt capacitances C 1 and C 2 of the CPW IDC of the type shown in Figure 1 with S g ϭ G f . Our results and those obtained using Gupta's expression [32] are shown in Table V in comparison with those presented in [15].…”

“…The lumped-element equivalent circuit shown in Figure 3 is used to model the CPW IDC [15]. Since a lumped-element model is used, the total size of the IDC should be much smaller than the operating wavelength.…”

“…Most of these studies concentrated on the design and analysis of microstrip interdigital capacitors. Very few tried to study CPW IDCs [15][16][17]. A 3D static finite-difference method (FDM) was used in [15] to characterize the CPW IDC and other CPW discontinuities.…”

Analysis of the Proximity Coupling of a Planar Array Quasi-Lumped Element Resonator Antenna Based on Four Excitation Sources

“…It is noteworthy that the pad capacitances do not depend on the size and the number of fingers, but rather on the substrate thickness, the length of the IDC, and finally, the effective line width. Therefore, it is also not impossible to have a large value of IDC without increasing the pad effect [14]. Essentially, the pads connected at both ends of the IDC acts as capacitor to ground with the sole aim of adjusting (tuning) the resonant frequency of the resonator, w eff is the effective line width given in Eq.…”