Comparison Between a Full-Wave and a Quasi-Static Analysis for High-Frequency Interconnects Crossover in Multilayered Dielectric Media

Microstrip discontinuities such as open ends, gaps, steps, bends, T junctions and crossing, which are fundamental passive components in microwave ad millimeter-wave monolithic circuits, have been extensively analysed by several authors. For multilevel integrated circuits, what kind of new typical transitions occur? We find, naturally, via holes and crossover between conducting strips. To date little has been reported on the exact analysis of such complex structures. Our object is to study a strip crossover in a multilayered dielectric media. Although the full-wave analysis provides the highest degree of accuracy, it requires extensrve analytical and numerical calculations. In comparison, the quasi-static analysis are tradionally faster in term of CPU time and analytical process than full-wave techniques. The choice ofa faster numerical tool (a quasi-static model) needs to define the range of validity. This leads to develop a full-wave and a quasi-static analysis. That was done and we show for a typical structure the discrepancy versus frequency.