Dielectric filter, dielectric duplexer, and communication apparatus

A dielectric filter comprising:

• a dielectric block including a plurality of holes extending from a first face of the dielectric block to a second face of the dielectric block, the second face being opposed to the first face;
• a respective inner conductor formed on an inner surface of each of the plurality of holes in the dielectric block such that the open ends of the plurality of holes are open-circuited;
• first balanced input/output terminals formed on an exterior surface of the dielectric block, the first balanced input/output terminals being capacitively coupled to respective open ends of a first hole of the plurality of holes;
• second balanced input/output terminals formed on the exterior surface of the dielectric block, the second balanced input/output terminals being capacitively coupled to respective open ends of a second hole of the plurality of holes;
• an outer conductor formed on the exterior surface of the dielectric block;
• and
• a ground electrode connected to the outer conductor, the ground electrode being formed at one of the first face and second face of the dielectric block.