Couplers & Hybrids
usually four port passive devices containing two
separate transmission lines, each having one port on each end that
come into proximity to each other such that microwave energy
propogating on one of the lines will couple to the other. The four
ports are almost always matched to an impedance of 50 ohms.
Midwest Microwave manufactures three basic types of couplers.
Directional Couplers, 90° Hybrid Couplers, and 180° Hybrid Couplers.