Cut-off characteristics of the normal TE0n modes in the circular waveguide with a dielectric cylinder and an azimuthally magnetized ferrite toroid

The azimuthally magnetized circular ferrite and ferrite-dielectric waveguides could find application in various microwave devices: digital phase shifters, cut-off switches and isolators, operating in the normal TE01 mode (G.N. Georgiev and M.N. Georgieva-Grosse, In: L. Rocha and G. Mateus (Eds.), Wave Propagation: Academy Publish, Cheyenne, Wyoming, USA, 161–196, 2014). The development of these devices requires a detailed knowledge of the phase behaviour of guiding lines mentioned and in particular of their cut-off frequencies. The information for the latter, however, is still insufficient (W. Che, E.K. Yung and J. Wen, J. Electromagn. Waves Applicat., 16 (8), 1103–1118, 2002, M.N. Georgieva-Grosse and G.N. Georgiev, in Proc. Fourteenth Int. Conf. Electromagn. Adv. Applicat. ICEAA´12, Cape Town, South Africa, 1194–1197, Sept. 2–7, 2012).