A MICROWAVE WAVEGUIDE TROMBONE PHASE SHIFTER

Abstract

A microwave phase shifter is described which is based on the sliding principle of the trombone and which involves the telescoping together of two snugly-fitting sections of rectangular waveguide of different cross-sectional dimensions. Quarter-wave transformers are used to reduce the reflection at the change of waveguide cross-section. An attempt is made to increase the bandwidth of the instrument by making the transformers of different lengths. A phase change of several wavelengths is possible with an error of approximately plus or minus one degree.