Accession Number : AD0600871

Title :   DEVELOPMENT OF ADVANCED MICROWAVE COMPONENTS AND TECHNIQUES - PLANAR HEXAGONAL FERRITES AND DEVICES.

Descriptive Note : Rept. for 28 Sep-28 Dec 63

Corporate Author : SPERRY RAND CORP CLEARWATER FLA SPERRY MICROWAVE ELECTRONICS DIV

Report Date : APR 1964

Pagination or Media Count : 46

Abstract : Studies were made of the effect of various processing variables on the dielectric loss of the planar hexagonal ferrites. Loss tangents which are of the order of 0.02 are the most severe limitations of the materials. Linewidths of approximately 290 oersteds were obtained on the Cu0.75Zn 1.25 Y compound. Attempts at orienting the grains of cubic polycrystalline materials produced yttrium iron garnet with aa linewidth of 18.5 oersteds, yttrium gadolinium iron garnet with a linewidth of 156 oersteds, and nickel ferrite (NiFe2O4) with a linewidth of 379 oersteds. Measurements and analysis of the application of planar hexagonal ferrites in isolator performance are reported. While the anisotropy field of the planar ferrite reduces the external field required for resonance, it is also shown to adversely effect some isolator characteristics. Measurements were made on both E and H-plane configurations. (Author)

Descriptors :   (*MICROWAVE EQUIPMENT, PRODUCTION), (*FERRITES, DIELECTRIC PROPERTIES), YTTRIUM COMPOUNDS, IRON COMPOUNDS, GARNET, NICKEL COMPOUNDS, ANISOTROPY

Distribution Statement : APPROVED FOR PUBLIC RELEASE