(Structure published in the MIC Simulation Columnon International Journal of Microwave and Millimeter-Wave Computer AidedEngineering, Volume 3, Issue 2, April 1993).

Substrate thickness = 0.635 mm, permittivity =9.8, permeability = 1

Conductor thickness = 0.005 mm, conductivity =4.9´107 s/m

Simulation Result:

Results other than IE3D's are from: Bill Pribble,"Applications of Electromagnetic Simulation to MMIC Design",MTT-S Workshop WMFA, Engineering Applications of Electromagnetic FieldSolvers, San Diego, May 1994.

Because the S11 is a small quantity, it can not be precisely predicted by any simulators or even the measurement. The most critical parameter in the comparison is the Ang(S21). Thickness has strong effect to the accuracy. In MOM codes, metallic strip is usually assumed as infinitely thin strip with the loss effect corrected using the surface impedance. Simulation results may not be accurate enough for thick metallic strips. On the IE3D, we can build the structure with 4 surfaces and model the thickness precisely. IE3D is the only one can do it and other simulators can only model thickness as parallel plates.