| 摘要 |
PURPOSE:To adjust the electric length by providing a dielectric board where plural through-holes are formed, forming resonance elements by the through- holes and dividing the dielectric board at a dividing face passing through the plural through-holes. CONSTITUTION:The dielectric board 22 is prolonged in a direction along the center axis of the through-holes 23A-23C and divided into two board halves 26A, 26B by using the dividing face 25 passing through the through-holes 23A-23C. The board halves 26A, 26B have symmetrical constitution to the dividing face 25, and a slot whose cross section is semispherical is formed on the face in the through-holes 23A-23C. A region 35 where no conductive metallic layer 19 is formed is provided at one side end face 22A of the through- holes 23A-23C, and a tip 31A of an adjusting screw 31 is opposed to the region 35 where no metallic layer 19 exists. The adjusting screw 31 is screwed to a screw guide 37 provided to a case 36 of a dielectric filter 21, turned for adjustment from the outer side of the case 36 to adjust the opposed length between the tip 31A and the region 35. |
