Absolute grid attenuator

The complex permittivity of some alcohols at 890$middot$8 GHz

“…As the path length through the specimen, situated in one arm of the interferometer, is increased, the path length of the other arm is also increased by a known amount to restore the received signal. A further improvement is that the self-calibrating attenuator described by Staniforth andAllnutt (1969, 1971) was also used in the arm containing the dielectric. This attenuator was used to maintain a constant signal at the detector.…”