Directionals couplers, are used to unevenly split signal. Uneven splitting of signal can be used to "daisy-chain" antennas instead of home-running each antenna back to the amplifier.
The "coupling" figure is ratio of the coupled output to the input.
RSRF signal couplers are a low cost, low insertion loss, high power, broadband solution for Distributed Antenna Systems (DAS) and cell phone signal boosters.
RSRF directional couplers cover from 698 MHz to 2700 MHz, and are thus usable with all North American 2G, 3G, and 4G LTE services on all carriers.