Continuously variable resistance attenuator using lossy transmis

Details Continuously variable resistance attenuator using lossy transmis Continuously variable resistance attenuator using lossy transmis

1975-06-09

1976-10-26

Gensler, Paul L.

Wave transmission lines and networks

Attenuators

323 94R, 338216, H01P 122

Patent

active

RE0290181

ABSTRACT:
A continuously variable resistance attenuator is described in which the signal conductor of a distortionless lossy transmission line is employed as an attenuation resistance uniformly distributed along such line, and the connection of an output contact is moved along such signal conductor to change the attenuator setting. The transmission line has a plurality of separate shunt resistors of equal value extending between the signal conductor and the ground conductor of the line and uniformly distributed along the line to provide a lossy line of uniform characteristic impedance. The input end of such lossy line is connected to a non-lossy line of the same characteristic impedance, and its other end is terminated in a termination resistor equal to such characteristic impedance. In one embodiment, the lossy transmission line is moved relative to a fixed input contact and a fixed output contact to provide a constant transit time for the signal to pass through the attenuator, due to the fixed distance between such contacts and to reduce the size of the contacts for improved high frequency response. The input contact is provided by a fixed portion of the non-lossy line which engages its movable portion attached to the lossy line to provide a transmission line stretcher of variable length.

REFERENCES:
patent: 1613423 (1927-01-01), Wegel
patent: 2517180 (1950-08-01), Davis
patent: 2536501 (1951-01-01), Hood et al.
patent: 2539352 (1951-01-01), Hewlett
patent: 2909736 (1959-10-01), Sommers et al.
patent: 3657688 (1972-04-01), Casey et al.

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