An RF Tapper is a device used to split an input signal into two parts. The ratio in which the signals are split is called the Split Ratio - This usually varies from 1:2 to 1:10000 - Depending on the application and power level. In theory, RF signal tappers are very similar to directional couplers.

Differences between RF Signal Tappers and Directional Couplers

• Tappers usually operate over a broader frequency range
• Tappers do not have an isolated port, as a result, there is no isolation between the two ports
• Tappers are Bi-Directional, i.e the input and output ports can be switched. Directional couplers have a fixed, input and output port (Dual Directional and Bi-Directional Couplers are Bi-Directional)
• In tappers, the Input and Output ports have excellent VSWR but coupled port has bad VSWR. While in directional couplers all 3 ports have excellent VSWR
• Tappers are usually less expensive when compared to directional couplers