Directional couplers provide flat coupling of one signal path to another in one direction only (known as directivity) and low VSWR over one full octave or more. They commonly consist of an auxiliary line coupling electrically to a main line, which becomes more complex as the bandwidth increases.
Tappers, also known as Signal Samplers, operate similarly to Directional Couplers but without the directivity. Tappers have the benefit of easily realizable broad bandwidths, are virtually indestructible and generally are lower priced.
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