Title :
Higher-order mode waveguide circulators for millimeter wavelengths
Author :
Tsankov, Mincho A. ; Ganchev, Stoyan I. ; Milenova, Lyudmila G.
Author_Institution :
Colorado State Univ., Fort Collins, CO, USA
fDate :
9/1/1992 12:00:00 AM
Abstract :
Higher-order circulation modes in cylindrical ferrite inserts are studied for use in millimeter-wave waveguide circulators. The numerical calculations of the resonance frequencies are compared with the measured mode spectrum of the demagnetized inserts, and show a typical error of 5%. Several narrowband (3-5%) higher-order mode circulators using this design are demonstrated. The merging of two higher-order modes is also observed which is very promising for the design of wideband millimeter-wave devices
Keywords :
circulators (microwave); ferrite devices; EHF; cylindrical ferrite inserts; demagnetized inserts; higher-order mode circulators; measured mode spectrum; merging of two higher-order modes; millimeter circulators; millimeter wavelengths; narrowband circulators; numerical calculations; resonance frequencies; waveguide circulators; wideband circulators; wideband millimeter-wave devices; Circulators; Demagnetization; Ferrites; Frequency measurement; Merging; Millimeter wave measurements; Narrowband; Resonance; Resonant frequency; Wavelength measurement;
Journal_Title :
Magnetics, IEEE Transactions on
