A computer-operated millimeter-wave insertion-loss and return-loss measurement system

A computer-operated millimeter-wave measurement system is described. The set performs automated insertion-loss and return-loss measurements on a stepped, discrete frequency basis, and covers the frequency range 40 to 110 GHz. Some notable features of the system are: a computer-controlled signal source of a BWO, extensive error reduction through real-time computer processing, and use of a harmonic comb mixer as a source of precisely known millimeter-wave reference frequencies. Measurement principles and performance features of the system are presented.