Feeders

1:1 Current Balun

  • This is the simplest current balun, consisting of two coils of wire connected as shown
  • The coils may use an air core or a ferrite core
  • Often a current balun is made by winding coaxial cable into a coil, with or without a ferrite core
  • The load impedance is not changed by the balun
  • The inductive reactance of the windings prevents common mode currents from flowing and ensures a balanced output
  • The inductive reactance should be 10 times the load impedance at the lowest frequency of operation