The objective of this research was to investigate electromagnetic interactions among components within microstrip-based circuits fabricated adjacent to the layered surround characteristic of a high-speed MMIC environment. EM fields maintained by currents immersed in layered dielectric/ferrimagnetic media are exploited to study the complete propagation-mode spectrum of microstrip lines and their interactions with the coupled microstrip devices which they interconnect. Topics studied include: (1) electromagnetics of layered dielectric/ferrimagnetic media; (2) mathematical ...