Directional couplers are designed for construction of chain-structured antenna and feeder transmission lines on such radio fixation objects as subways, underground garages, high-rise buildings, sea ships, etc.
Directional couplers make it possible to partially withdraw energy from the feeder and service a small part of a subway or a room by means of a local antenna. Due to a wide service band, the directional couplers can be used in professional trunking communications of analog and digital standards (for instance, APCO25 and TETRA), and also, together with CDMA repeaters.
Schematical diagram
