Accession Number : AD0618915

Title :   INVESTIGATION OF MICROWAVE NON-LINEAR EFFECTS UTILIZING FERROMAGNETIC MATERIALS.

Descriptive Note : Final rept. for 17 Mar 62-16 Feb 65,

Corporate Author : MELABS PALO ALTO CALIF

Personal Author(s) : Donaghey,Lee F. ; Roberts,Roy W. ,Jr.

Report Date : 16 FEB 1965

Pagination or Media Count : 96

Abstract : Ferrite parametric amplification was demonstrated in Ku band with Yttrium Iron Garnet (YIG). A detailed theoretical analysis was derived which allows comparison between the ferrite amplifier and the diode amplifier. In theory, both amplifiers have similar threshold pump powers. Diode Q's are generally lower than YIG Q's. Furthermore, diode Q's decrease with increasing frequency while YIG Q's increase or at least remain constant. Off-setting this is the fact that diodes have a much larger non-linear coupling term. Furthermore, this non-linear coupling term remains constant with increasing frequency for the diode, whereas it decreases for the ferrite. Magnetodynamic mode operation is demonstrated as a useful method of operation of the ferrite amplifier, having some of the advantages, as well as disadvantages, of both the electromagnetic and magnetostatic modes of operation. Magnetodynamic operation is further broken down into three types depending on the position of the signal and idler modes relative to the Walker magnetostatic spectrum. (Author)

Descriptors :   (*MICROWAVE EQUIPMENT, NONLINEAR SYSTEMS), (*PARAMETRIC AMPLIFIERS, FERROMAGNETIC MATERIALS), (*FERROMAGNETIC MATERIALS, PARAMETRIC AMPLIFIERS), (*GARNET, PARAMETRIC AMPLIFIERS), K BAND, YTTRIUM COMPOUNDS, IRON COMPOUNDS, PUMPING(ELECTRONICS), WAVEGUIDES, NOISE, GEOMETRIC FORMS, RESONATORS, DIELECTRICS, MAGNETIC PROPERTIES

Distribution Statement : APPROVED FOR PUBLIC RELEASE