Abstract
Experimental verification at X and K band of theoretical calculations on the magnetodynamic resonant modes of a ferrite rod between parallel conducting sheets is reported. Critically coupled mode Q's as high as 1100 have been measured. The characteristic equation includes propagation effects and dipolar coupling between electron spins. Mode charts for the symmetric modes are displayed for biasing fields from 3 to 20 koe and for frequencies from 4 to 50 kMc for both Ferramic R-1 and polycrystalline YIG. The modes have been experimentally observed in the ranges of 10 and 20 kMc. Comparison of theoretical and experimental data is made in these bands for both R-1 and YIG. The variation of the observed loaded Q with biasing magnetic field is described. The advantages that these modes possess over the magnetostatic modes for microwave engineering applications are pointed out. These include: (a) relatively high Q, (b) ability to critically couple, and (c) sample size is comparable to the wavelength.
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