Theoretical modeling of microstrip thin-film circulators

We have calculated the S-parameters and losses in ferrite film junction circulators using a new effective-field theory assuming TEM-like propagation. At X-band conductivity loss dominates the dielectric and magnetic losses in Y-junction circulators fabricated on low-loss ferrite films with thickness...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1997-09, Vol.33 (5), p.3433-3435
Main Authors: How, H., Oliver, S.A., McKnight, S.W., Zavracky, P.M., McGruer, N.E., Vittoria, C.
Format: Article
Language:English
Subjects:
Circulators
Conductivity
Dielectric losses
Dielectric thin films
Ferrite films
Magnetic losses
Microstrip
Propagation losses
Scattering parameters
Transistors
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Summary:We have calculated the S-parameters and losses in ferrite film junction circulators using a new effective-field theory assuming TEM-like propagation. At X-band conductivity loss dominates the dielectric and magnetic losses in Y-junction circulators fabricated on low-loss ferrite films with thicknesses less than 200 /spl mu/m. Our calculations compare closely with experiments.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.617968