FREQUENCY BIAS-FIELD MODE CHARTS FOR GYROMAGNETIC WAVE-GUIDES

Axially magnetized ferrite phase-shift sections can be biased above or below ferrimagnetic resonance. Mode charts displayed in terms of freq uency/bias field, rather than tensor entries, cater for partial magnet ization From this construction it is shown that TM modes have separate onset frequencies above and below ferrimagnetic resonance leading to unique modal hierarchies in each region. For one waveguide structure t he theoretical cutoff numbers are compared with experimental data and the phase-shift calculations are separately corroborated by finite-ele ment solutions. (C) 1995 John Wiley & Sons, Inc.