Accession Number : AD0282976

Title :   RESEARCH ON A PASSIVE SOLID STATE LIMITER

Corporate Author : RAYTHEON CO WALTHAM MASS

Personal Author(s) : MILANO,U. ; SCHLOMANN,E. ; GREEN,J.

Report Date : 30 APR 1962

Pagination or Media Count : 1

Abstract : The results of theoretical and experimental investigations of basic phenomena involved in the operation of microwave ferromagnetic limiters are presented. These results concern in particular: contribution of the three-magnon relaxation processes to the relaxation rate observed in ferromagnetic resonance experiments; extension of the original theory of parallel-pumped instabilities to a case in which exact boundary condtions have to be taken into account; behavior of the magnetic susceptibility above threshold; transient response to a strong rf magnetic field; and possible extension of limiters utilizing first-order nonlinear effects at resonance to frequencies higher than the ones presently attainable. The different problems connected with the realization of practical microwave ferromagnetic limiters are analyzed and experimental results are presented concerning: properties of the materials to be used; microwave srucure; and transient behavior. The results obtained on a microwave limiter utilizing a new microwave structure in the form of a ridged-waveguide section are presented. (Author)

Descriptors :   *FERROMAGNETIC MATERIALS, *MICROWAVES, BOUNDARY LAYER, MAGNETIC FIELDS, RELAXATION TIME, RESONANCE, STABILITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE