A typical VLSI circuit contains a large number of devices with planar metallic interconnects between them. Frequently, these interconnects are in the form of microstrip, analogous to what might be used in a millimeter-wave or microwave integrated circuit. Results of theoretical and experimental studies of the the device interconnect problem are presented. Multiple-line terminated and unterminated problems were treated. Full-wave data for pulse- and time-harmonic propagation are presented. Theoretical and experimental frequency- and time-domain data for the two-line problem are given which include effects of device terminations. These results illustrate the time and spatial coupling phenomena for typical VLSI geometries.