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Directional Couplers: How do you specify them?

Directional couplers are an integral poart of any RF system. They are used to sample a portion of an incoming RF signal without affecting the mainline losses signifcantly as opposed to power splitters.

Some of the uses of a directional coupler are:

  • monitoring power levels
  • input power protection
  • automatic gain control
  • automatic power level control
  • system self-test
  • system calibration
  • phase locked loops on synthesizers