
Accession Number : AD0277361
Title : UHF FERROMAGNETIC PHASE SHIFTERS (200400 MC)
Corporate Author : CHU ASSOCIATES LITTLETON MASS
Personal Author(s) : FITZGERALD,WILLIAM D. ; KLEIN,LESLIE
Report Date : 30 JUN 1961
Pagination or Media Count : 1
Abstract : UHF ferrite phase shifters are discussed which are unusually compact and require low drive fields. These devices use a dualmode network with nonlinear phase properties. The nonlinear phasemultiplier property of this network enables the design and construction of very compact devices. Their operation is based on domainwall resonance. The material chosen has an internal magnetic field large enough for operation above ferromagnetic resonance, so operation is in the low loss region even for zero, or small, applied control fields. The closed path toroidal geometry implies an efficient magnetic circuit and also contributes to the low field requirements. Two ferrite phase shifters were constructed using the dualmode network. The first, designed for narrow band operation in the 200 to 350 mc range, is composed of eight dualmode sections arranged to form a concentric square crosssection. The side dimension of this square is 21/8 inches; the length of the phase shifter is 31/8 inches. The second device, designed to cover the broader band from 225 to 400 mc, is composed of six dualmode sections set in a concentric triangular crosssection. This triangle is approximately 21/2 inches on a side and the stripline in this case is approximately 21/3 inches long. The first device requires 100 oersteds drive field for 360 degrees differential phase shift while the second device requires 130 oersteds for the same phase shift. (Author)
Descriptors : *PHASE SHIFT CIRCUITS, FEASIBILITY STUDIES, FERRITES, FERROMAGNETIC MATERIALS, FERROMAGNETISM, RADAR ANTENNAS, RADAR SCANNING, RESONANCE, STANDING WAVE RATIOS, ULTRAHIGH FREQUENCY
Distribution Statement : APPROVED FOR PUBLIC RELEASE