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A FERRITE UHF PHASE-SHIFTER
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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A description is giv n of a uhf phase-shifter which varies the phase of an ou put signal from 0 to 360 degrees by varying the longitudinal magnetic field applied to the ferrite from 0 to 250 oersteds. The phase-shifter is of simple design and has comparatively small dimensions. It consists of a coaxial spiral line with the ferrite inside it. The input and output of the line are made in the form of a 75-ohm coaxial cable plug. Inside the spiral line are two ferritic cores. A two-layer winding of PEL-1 25 wire in a water jacket is wound on the outer cylinder of the coaxial spiral line for the purpose of creating a magnetic field. The line attenuation and the phase shift w re measured at a fr uency of 150 Mc. The characteristics of the phase- ifter are such that w en the gnetic field varies from 0 to 250 oersteds, the phase shift of the signal amounts to 360 degrees, and the attenuation decreases from 12 to 3.2 db. Author
APPROVED FOR PUBLIC RELEASE