Patent ID: 7561011

Claim:
A dielectric device comprising: a dielectric substrate; at least one resonator unit; and at least one terminal, said dielectric substrate being shaped to have first and second surfaces opposed to each other in a first direction and third and fourth surfaces opposed to each other in a second direction perpendicular to said first direction, said dielectric substrate having an external conductor film at least on said second, third and fourth surfaces, said resonator unit including first and second holes, said first hole being provided in said dielectric substrate, extending along said first direction with one end thereof opening on said first surface, and having a first internal conductor inside thereof, said second hole being provided in said dielectric substrate, extending along said second direction with one end thereof opening on said third surface and the other end thereof connected to said first hole, and having a second internal conductor inside thereof, said second internal conductor having one end thereof connected to said external conductor film on said third surface and the other end thereof connected to said first internal conductor inside said dielectric substrate, said first hole extending beyond a junction with said second hole to have an extension opposed to said second surface, said terminal being provided on said second surface, separated from said external conductor film by a gap, and opposed to said first internal conductor in said extension of said first hole across said dielectric substrate, said first hole having a recess opposed to said junction along said second direction, said first internal conductor in said recess being opposed said external conductor film on said fourth surface across said dielectric substrate.