Electrodes having slot patterns, electrodes having strip patterns, or
dielectric strips, for example, form transmission lines and resonator
patterns on the upper faces of dielectric substrates or conductive
substrates, for example. Resonators formed by the resonator patterns are
arranged at the ends of the transmission lines at the end portions of the
substrates. A pair of the resonators are electromagnetically coupled to
each other, whereby the corresponding transmission lines are also
connected to each other.
