Uses of Transmission Lines - opracowanie

Uses of Transmission Lines Transmission lines are commonly used for getting either power or signals in a regulated
way from one point to another, without those signals radiating into space or becoming
otherwise coupled to other circuits where they are not wanted.
Transmission lines are normally made uniform in cross section. One reason for making
them uniform in cross section is that if the geometry is regular all of the effects discussed
earlier become predictable without undue complexity.
As stated briefly above, a reason for the use of transmission lines, particularly of the
coaxial variety, is that they can reduce or eliminate unwanted coupling between different
parts of the circuit. When such coupling comes about from electric fields, those electric
fields terminate on charges which remain on the outside of the outer conductor and do not
become part of the voltage or currents which are flowing on the inside. When the unwanted
coupling is via magnetic field, twin lines may be used in the twisted pair configuration so
that the magnetic flux which links a part of the circuit is approximately cancelled by the
magnetic flux linking another part, and only small net coupling exists.
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