MODELING OF COPLANAR STRIPLINE DISCONTINUITIES

The paper presents a technique to obtain lumped equivalent circuit mod els for typical coplanar stripline (CPS) discontinuities such as an op en circuit, a short circuit, and a series gap in one of the strip cond uctors and gives their element values as a function of the discontinui ty physical dimensions for a specific substrate. The model element val ues are determined from the discontinuity scattering parameters which are de-embedded from the measured scattering parameters using a thru-r eflect-line (TRL) algorithm. In addition, the resonant frequency of a spur-slot is presented as a function of the spur length. The experimen tal results are validated by data obtained using the finite-difference time-domain (FDTD) technique.