Dielectric filter, dielectric duplexer, and communication apparatus incorporating the same

A dielectric filter comprising:

• a dielectric block;
• a plurality of conductive through holes arranged in the dielectric block, each of the conductive through holes having an open end along a first surface of the dielectric block;
• a respective coupling electrode connected to each conductive through hole, each coupling electrode formed on the first surface of the dielectric block and extended at least to a first edge of the dielectric block, the coupling electrodes having a common and continuous, non-conductive gap therebetween shared by the respective coupling electrodes and generating a capacitance therebetween so as to couple the plurality of conductive through holes;
• and
• an outer conductor arranged on outer surfaces of the dielectric block,
• wherein the coupling electrodes further extend onto a second surface of the dielectric block which intersects the first edge of the dielectric block.

A dielectric filter comprising:

• a dielectric block;
• a plurality of conductive through holes arranged in the dielectric block, each of the conductive through holes having an open end along a first surface of the dielectric block;
• a respective single coupling electrode connected to each conductive through hole, each coupling electrode formed on the first surface of the dielectric block and extended at least to a first edge of the dielectric block, the coupling electrodes having a common and continuous, non-conductive gap therebetween shared by the respective coupling electrodes and generating a capacitance therebetween so as to couple the plurality of conductive through holes;
• an outer conductor arranged on outer surfaces of the dielectric block;
• and
• input/output electrodes arranged on a second surface of the dielectric block and extending from a second edge, opposing the first edge, to generate capacitances between the open ends of the conductive through holes and the input/output electrodes.

A dielectric filter comprising:

• a dielectric block;
• a plurality of conductive through holes arranged in the dielectric block, each of the conductive through holes having a open end along a first surface of the dielectric block;
• a respective coupling electrode connected to each conductive through hole, each coupling electrode formed on the first surface of the dielectric block and extended at least to a first edge of the dielectric block, the respective coupling electrodes having a gap therebetween and generating a capacitance therebetween so as to couple the plurality of conductive through holes;
• and
• an outer conductor arranged on outer surfaces of the dielectric block;
• and
• input/output electrodes arranged on a third surface of the dielectric block and extending from a second edge, opposing the first edge, to generate capacitances between the open ends of the conductive through holes and the input/output electrodes,
• wherein the coupling electrodes further extend onto a second surface of the dielectric block which intersects the first edge of the dielectric block.