HP (Hewlett-Packard) - HP 774D

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JULY 1986 Page 2 HP 774D 775D DESCRIPTION The Hewlett Packard Model 774D and 775D Dual Directional Couplers are three port passive devices for use in 7 mm 50 ohm systems A coupler is essentially a device for sampling power flowing in one direction in a transmission line Since no coupler is perfect some power flowing in the opposite unwanted direction is also sampled The rejection of power flowing in the unwanted direc tion is called directivity and is the most important specification of a directional coupler These coup lers have 40 dB directivity Another specification is the forward coupling attenuation usually called just coupling which is the fractional amount of power transferred in the wanted direction These couplers have a nom...