DUALITIES IN CIRCULAR GYROTROPIC DISKS AND WAVE-GUIDES

Longitudinally magnetized gyroelectric waveguide with circular electri c wall boundaries exhibit split limit-TE cut-off numbers but degenerat e limit-TM cut-off numbers for non-symmetric modes. The magnetic wall waveguide displays degenerate limit-TE and limit-TM cut-off numbers. T hese results have been deduced directly from the characteristic equati ons of the related planar circuits. The existence of dual characterist ics between gyroelectric and gyromagnetic planar structures with elect ric and magnetic walls interchanged are confirmed. Measured resonant f requencies are compared with theoretical models for some gyromagnetic devices.