To divide power to couple signals
In-line low power splitters are used for dividing power equally to 2,3, or 4 branches and are very convenient to install. Isolation between output ports is 20 dB for most frequencies. The splitter is based on Wilkinson design. Resistors included in it affect the PIM. High Power splitters are dividing power equally to 2, 3, or 4 branches. These splitters were designed with air-line dielectrics, allowing excellent performance – low loss, low PIM, and low VSWR Tappers are coupling a signal to a branch line. Coupling is done in two directions. Coupling is measured between the two output ports, showing exact power ratio (i.e. 30 dB tapper has 1000:1 ratio). Tapper has DC connection to the branch line, making it ideal for sampling. Tapper has advantage on directional coupler in few aspects, especially for wide band (such as 380 – 2700 MHz). It is smaller, less expensive, and its matching is more accurate (lower VSWR). But it has less isolation and is used mainly for testing and sampling.