| 摘要 |
PROBLEM TO BE SOLVED: To provide a dielectric filter having improved inductive coupling for miniaturization. SOLUTION: A dielectric block 100 is constituted of an open end upper surface 110; a plurality of penetrated resonance holes 111a to 111c, containing a short-circuit end lower surface 130 and a grounding surface 120; a filter body containing an uncoated area, surrounding each resonance hole of the upper surface; and I/O pads 123, 124 which are located away from each other for isolation from a coated region of the grounding surface 120 by the uncoated region. Between resonance hole projection regions where both the outside resonance holes among the plurality of resonance holes are projected in rectangular shape on the grounding surface 120, a first inductive coupling part 125 is provided with the uncoated region which has a set transverse length and vertical width, that the neighbor to the lower surface 130 of the dielectric block with the width is set to uneven width comprising a large width on both sides and a small width between the large widths.
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