AUTOMOTIVE DEFOGGER GRID ANTENNA POWER ISOLATION

摘要

This paper will show a solution to the problem of isolating defogger power connections from an automotive antenna using a tri-filer wound transformer with a ferrite core where the power current flow is organized so that the magnetic field induced by the heater power wires is canceled. The transformer coupling remains effective at low frequencies. A capacitive coupling link is used to permit the system to work at FM frequencies.