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.
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How et al. (1997) studied this question.
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