Title :
Electromagnetic wave transmission in a well logging cable-theory
fDate :
10/1/1990 12:00:00 AM
Abstract :
A well logging cable is idealized as a uniform cylindrical structure consisting of N axial dielectric-coated thin wires in a lossy medium, all encased by a metallic sheath. A general modal equation which is specialized to low frequencies where quasi-static conditions prevail is developed. It is pointed out that the line parameters are spatially dispersive, in addition to being frequency dependent. The formulation differs from most multiconductor transmission theories because of the presence of the lossy filler material, which actually allows for a simplification of the working mode equation, which is an N-order polynomial
Keywords :
cables (electric); electromagnetic wave transmission; equivalent circuits; geophysical prospecting; transmission line theory; axial dielectric-coated thin wires; lossy filler material; lossy medium; low frequencies; metallic sheath; modal equation; polynomial; quasi-static conditions; spatially dispersive line parameters; uniform cylindrical structure; well logging cable; working mode equation; Cable shielding; Dielectric losses; Dispersion; Electromagnetic scattering; Equations; Frequency dependence; Polynomials; Propagation losses; Well logging; Wires;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
