Abstract
AbstractThe propagation characteristics of the magnetostatic surface wave in a composite waveguide with a YIG film and YBCO were investigated theoretically and experimentally.First, using the equivalent complex permittivity of YBCO obtained by the two‐fluid model and the permeability tensor of a YIG film, the dispersion relationship of the waveguide was derived. It was proved theoretically that a strong nonreciprocity within the 2.4‐GHz bandwidth with low loss could be achieved by placing superconducting material in the waveguide. The influence of magnetic loss of YIG, ΔH, on the superconducting material also was discussed in detail and it was found that when ΔH exceeded 1 Oe, the effect on the loss reduction by YBCO disappeared.The propagation characteristic of the magnetostatic surface wave in the waveguide with superconducting material was evaluated experimentally at liquid nitrogen temperature. Through a comparison of this result with that obtained in a waveguide with copper, nonreciprocity was discussed. In addition, the delay characteristic of the waveguide with a composite structure of YIG‐YBCO was demonstrated experimentally.
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