A hybrid coupler is a passive device used in radio and telecommunications. It is a type of directional coupler where the input power is equally divided between two output ports. For further information see Power dividers and directional couplers.
References
D. M. Pozar, Microwave Engineering, Third Edition, John Wiley & Sons, Inc., N.J. 2005.
G. R. Jessop. (1993). VHF UHF Manual. 4th ed. n.p.: Radio Society of Great Britain. p. 9.31.
