A superconductive filter includes a superconductive filter substrate
having a dielectric substrate and a plurality of resonator patterns
formed on a surface of the dielectric substrate, the plurality of
resonator patterns including a superconductive material; a package
accommodating the superconductive filter substrate; and an intermediate
substrate disposed between an inner surface of the package and the
superconductive filter substrate, and thermally coupling the package and
the superconductive filter substrate wherein a difference between a
degree of contraction of the intermediate substrate and the degree of
contraction of the dielectric substrate is smaller than a difference
between the degree of contraction of the dielectric substrate and the
degree of contraction of the package, when the package, the intermediate
substrate, and the dielectric substrate are cooled from room temperature
to a critical temperature of the resonator patterns.