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RESEARCH ON SELECTED MICROWAVE PROPERTIES OF FERRITES.
Final rept. 1 Apr 62-28 Feb 65,
MICROWAVE LAB STANFORD UNIV CALIF
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Controlled steering of a microwave acoustic beam in a ferrite was demonstrated in a YIG rod, where the direction of an acoustic beam was varied by varying the magnitude of a dc magnetic field applied at an angle to the rod axis. Analysis has been made of the frequency passband characteristics of multiple film acoustic transducers for microwave frequencies. The theory of microwave dielectric resonators without conducting walls has been developed, and experimental results on the principal circuit properties of rutile resonators have been obtained. A theory has been developed for mechanisms contributing to the excitation of phonon instabilities in ferrites. A theory has been developed for the coupling efficiency of ferrite disks as magnetostrictive acoustic transducers. Experimental investigations of nickel film magnetostrictive transducers have been performed. Measurements have been made of acoustic attenuation at room temperature in sapphire and rutile, which have disclosed that these materials offer low loss acoustic wave transmission at microwave frequencies. Theoretical and experimental investigations of second harmonic generation in ferrites have established the upper bounds on conversion efficiency for low loss ferrites.
APPROVED FOR PUBLIC RELEASE