Title :
On the limitation of the weak-coupling assumption for crosstalk analysis based on quasi-TEM propagation
Author :
Riley, Douglas J. ; Bacon, Larry D.
Author_Institution :
Sandia Nat. Lab., Albuquerque, NM, USA
fDate :
2/1/1990 12:00:00 AM
Abstract :
The limitation of the weak-coupling assumption for the case of two transmission lines with a common ground is examined. The analysis is based on the mathematical structure of solutions to the telegrapher´s equations, and, therefore, quasi-transverse electromagnetic (TEM) propagation is assumed. All loss is neglected, and the lines are assumed to be symmetric. Requirements that are necessary for the weak-coupling assumption to hold in a homogeneous medium as well as in a medium that possesses certain types of inhomogeneities are derived by examining both the fully coupled and the weakly coupled forms of the telegrapher´s equations. It is shown that terminating impedances influence the validity of the weak-coupling solution locally to resonances but have little effect elsewhere. Theoretical and experimental results are given in both the frequency and time domains for several geometries. A solution to the weak-coupling form of the telegrapher´s equations is provided
Keywords :
crosstalk; electric impedance; electromagnetic wave propagation; frequency-domain analysis; time-domain analysis; crosstalk analysis; frequency domain; fully coupled equations; quasi-TEM propagation; telegrapher´s equations; terminating impedances; time domains; two transmission lines; weak-coupling assumption limitation; Conductors; Couplings; Crosstalk; Equations; Frequency; Laboratories; Propagation losses; Transmission line theory; Transmission lines; Voltage;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on