WT4 Millimeter Waveguide System: Electrical Transmission Measurement System

During 1975 and 1976 a field evaluation test of the WT4 millimeter waveguide transmission system was conducted jointly by AT&T Long Lines, Western Electric, and Bell Laboratories. A major component of this test was the installation and evaluation of 14 km of the buried waveguide transmission medium. This paper describes an electrical transmission measurement system which measures the TEoi circular mode transmission loss in the installed waveguide medium throughout the 33 to 117 GHz frequency band under consideration. This system has been used for evaluation of waveguide lines ranging from 0.1 to 14 km in length at frequency spacings as small as 50 MHz. The field evaluation 2025 - a - 1 C01 ° TE. -10 T E OUTGOING PULSE TRANSMITTER MODE TRANSDUCER AND TAPER I SHORT CIRCUIT SHUTTER DELAY LINE 0 TEST LINE RETURNING PULSE RECEIVER 60mm WAVEGUIDE Fig. 1--Pulse reflection loss measurement arrangement.