| 摘要 |
PURPOSE: A dielectric filter is provided to facilitate the manufacturing of the product by using resonance recesses and trim portions. CONSTITUTION: A dielectric body(110) induces electric polarization. First and second resonance recesses(111,112) are separated from each other on the lower surface of the dielectric body(110). The first and second resonance recesses(111,112) have semi-spherical shapes. A conductive film(120) is coated on the surface of the dielectric body(110) except for the lower surface of the dielectric body(110). First and second trim portions(141,142) has a predetermined capacitance(Cs). An input terminal(131) is formed at a position which is opposite to the first trim portion(141). An output terminal(132) is formed at a position which is opposite to the second trim portion(142).
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