cutoff attenuator

cutoff attenuator

[′kət‚ȯf ə′ten·yə‚wād·ər]
(electromagnetism)
Variable length of waveguide used below its cutoff frequency to introduce variable nondissipative attenuation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.