Controlling Radiation from External Cables
Differential-mode (DM) excitation, where the currents are balanced (equal and opposite) in the wire pairs. Unless the outgoing and return carriers are spaced very far apart and untwisted, this mode is a minor contributor, though measurable.
Common-mode (CM) excitation, where the unbalanced portion of the current flows in the whole cable-to-ground loop. Due to the huge size of the antenna, this mode largely dominates DM excitation.
KeywordsGround Plane Coaxial Cable Shield Effectiveness Cable Length Transfer Impedance
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