| 摘要 |
PURPOSE: A dielectric filter improving inductive coupling is provided to reduce the size by providing a non-coated inductive coupling unit having a non-uniform width on a ground contact surface to form an inductive coupling between resonance holes. CONSTITUTION: A dielectric block comprises an upper surface(110) including a region that does not coated with a conductive material, a lower surface(130) coated with the conductive material, and a ground contact surface(120). A plurality of resonance holes(111a,111b,111c) penetrate from the upper surface(110) to the lower surface(130). A filter body includes non-coated regions around each of the resonance holes(111a,111b,111c) on the upper surface(110) of the dielectric block. Input/output pads(123,124) are provided on the ground contact surface(120). A first inductive coupling unit(125) is provided between resonance hole projection regions that the resonance holes(111a,111c) are projected onto the ground contact surface(120).
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