Characteristics of a shielded line: The coaxial lines used for the transmission of electromagnetic waves consist of an external conductor of cylindrical shape, with an inner conductor arranged along the axis of the former. The two conductors are separated by dielectric material of suitable features.
One of advantage of this kind of lines in that these lines are intrinsically self shielding, due to the geometry of arrangement of two conductors. Moreover the shielding features of the coaxial lines improve when the frequency increases.
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