Patent ID: 7760050

Claim:
A dielectric filter comprising: a dielectric block having first and second opposed surfaces, third and fourth opposed surfaces, and fifth and sixth opposed surfaces; a plurality of inner-conductor holes provided inside of the dielectric block and extending between the first surface and the second surface of the dielectric block; an outer conductor on at least a portion of each of the second to sixth surfaces of the dielectric block; and at least two input/output electrodes, a first of the at least two input/output electrodes extending from the third surface to the fifth surface, a second of the at least two input/output electrodes extending from the fourth surface to the fifth surface, each of the at least two input/output electrodes being separated from the outer conductor by an outer-conductor-free part, wherein a first side of at least one of the first and second input/output electrodes proximal to the first surface is substantially in parallel to the first surface and a second side of the at least one of the first and second input/output electrodes is tapered relative to the second and sixth surfaces, the first and second sides being located on one of the third and fourth opposed surfaces, and wherein the first side and the second side of the at least one of the first and second input/output electrodes are dimensioned and positioned such that a first coupling volume to a TE mode is lower than a second coupling volume to a TEM mode.