Analysis of electromagnetic coupling effects in integrated Josephson junction logic devices by the FDTD technique

A very important step of the design of circuits and devices in the Josephson junction technology is the complete and correct calculation of their electrical characteristics. Due to the very high clock speed of up to 100 GHz, dynamic effects like the electromagnetic coupling start to play a significant role over the operation of the system. The presented work reports on the implementation of the FDTD technique for the description of the electromagnetic coupling effects in the Josephson devices. Some typical microstrip layouts are considered strictly taking in account the technological specifications. The obtained results are analyzed in respect to the constraints, which the coupling effects impose on the lateral dimensions of the microstrip lines.