Accession Number : AD0425910

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

Descriptive Note : Quarterly progress rept. no. 6, 17 May-16 Aug 63,

Corporate Author : MELABS PALO ALTO CALIF

Personal Author(s) : Donaghey,Lee F.

Report Date : 16 AUG 1963

Pagination or Media Count : 25

Abstract : Coupled mode equiations are presented for coupling of magnetostatic modes to dielectric cavity resonances. The coupled mode equations predict a fundamental difference between the types of coupling possible when a magnetic bias field is applied parallel and perpendicular to the axis of a ferriteloaded dielectric cylinder. Evidence is presented for the appearance of two distinct families of magnetodynamic resonances near the high field boundary of Walker mode spectrum. Enhancement of pumping by means of fine wire mounted in waveguide is analyzed and calculated field intensities compared with experimental data. With the wire adjacent to a 0.149 in. dia Y1G sphere, a pump power threshold minimum for oscillation of 40.4 watts, and for amplification of 31 watts is reported. The threshold for the onset of instabilities is compared with that for oscillation; the two thresholds converge for a value of Hdc near to (omega sub p/28) + 2 pi M/3), corresponding to pumping at the high field boundary of the Walker spectrum. (Author)

Descriptors :   (*FERRITES, MICROWAVE FREQUENCY), (*MICROWAVE FREQUENCY, PHYSICAL PROPERTIES), (*PHYSICAL PROPERTIES, NONLINEAR SYSTEMS), FERROMAGNETIC MATERIALS, TEMPERATURE, MATHEMATICAL ANALYSIS, FREQUENCY SHIFT, TIME, CAVITY RESONATORS, MICROWAVE AMPLIFIERS, MAGNETIC FIELDS, RESONANCE, WAVEGUIDES, ELECTRIC WIRE, TUNING DEVICES, PUMPING, STABILITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE