Ferrite Phase Shifter for the UHF Region

An extremely compact, low-loss, ferrite phase shifter has been developed for the 200 to 800-mc region. It consists of a folded stripline structure approximately 61/2 inches long and less than 1 inch square in cross section. The device requires a longitudinal magnetic field of sufficient intensity to place the operating region above resonance. For field swings of about 900 oersteds (from 430 to 1250 oersteds at 400 mc), 360° change in phase shift can be obtained with about 1 db of loss. The phase shifter is reciprocal and shows identical low-power and high-power characteristics up to at least 10-kw peak. Some additional data are included on the operation of the phase shifter down to 10 mc and up to 2000 mc.