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Studying the Propagation of an Ultrashort Pulse in a Cable Attached to a PCB System with Modal Reservation

The paper considers modal reservation (MR) which allows both increasing the circuit reliability and implementing the effect of modal filtering. The results of studies of the ultrashort pulse propagation in a cable attached to a printed circuit board (PCB) system with modal reservation are presented. Two versions of its implementation for a PCB with front and end electromagnetic (EM) coupling were investigated. It is shown that for the version with the front EM coupling, the difference in the decomposition pulse delays does not change the sign and varies from 2.2 to 2.65 ns for the maximum cable and PCB lengths, respectively. For the version with the end EM coupling, the delay difference changes the sign and varies from minus 1.25 to 2.65 ns for the maximum board and cable lengths, respectively. Therefore, with a length ratio of 0.32, the delay difference will be equal to 0. Similar studies are important when implementing an MR in series-connected structures.