Directional or hybrid couplers
Directional coupler enables a branch line to transfer signal coupled from signal in a transmission line. A signal from the branch line can move only in one direction – toward the input port. WIREWAVE offers air-dielectric microstrip couplers, designed for high performance. The directivity (difference in power transmitted between input of main line and the branch line) is high – over 20 dB. Can be used to separate part of the signal or combine signals. Used in DAS system as power divider (or combiner). Hybrid Couplers combine signals from two different bands (and divide them in the opposite direction) without any interaction. In DAS systems it is commonly used to combine signals from different carriers.