Accession Number : AD0277361

Title :   UHF FERROMAGNETIC PHASE SHIFTERS (200-400 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 dual-mode network with non-linear phase properties. The non-linear phase-multiplier 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 dual-mode network. The first, designed for narrow band operation in the 200 to 350 mc range, is composed of eight dual-mode sections arranged to form a concentric square crosssection. The side dimension of this square is 2-1/8 inches; the length of the phase shifter is 3-1/8 inches. The second device, designed to cover the broader band from 225 to 400 mc, is composed of six dual-mode sections set in a concentric triangular cross-section. This triangle is approximately 2-1/2 inches on a side and the strip-line in this case is approximately 2-1/3 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