DEVELOPMENT OF ADVANCED MICROWAVE COMPONENTS AND TECHNIQUES, PLANAR HEXAGONAL FERRITES AND DEVICES.
Quarterly rept. no. 4, 28 Dec 63-28 Mar 64.
SPERRY RAND CORP CLEARWATER FLA SPERRY MICROWAVE ELECTRONICS DIV
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Efforts to reduce the dielectric loss tangent of planar hexagonal ferrites through the use of iron deficient compositions have produced only marginal improvements in the Zn2Y materials and no observable improvement in the loss tangent of Cu0.75Zn1.25Y. When iron deficiencies of as much as ten percent are used diffraction lines corresponding to crystal structures other than the Y structure are seen. X-ray diffraction studies of nickel ferrite pressed in the presence of a dc magnetic field have shown positive evidence of crystallite orientation. Narrowest X-band linewidth measured on this partially oriented nickel ferrite is 268 oe. An analysis of the application of planar hexagonal ferrites in phase shifters, with consideration given to their ultimate use in switching devices, is reported. The effect of dielectric loading on planar hexagonal ferrite phase shifters is also discussed. Effects of the planar anisotropy field on the performance of differential phase shifters is determined, and this anisotropy field is shown to have a detrimental effect on phase shifter operation. Some measurements on the response of phase shifters utilizing planar hexagonal ferrites at C-and X-band are given. The hysteresis loop parameters of the planar hexagonal ferrites are reported. Author