| 摘要 |
PURPOSE: A dielectric filter is provided to minimize the size of the dielectric filter and minimize the influence of the exterior electromagnetic field by forming a plurality of resonance recesses. CONSTITUTION: A dielectric body(110) induces polarization. First, second, and third resonance recesses(111,112,113) are formed on the lower surface of the dielectric body(110). The first, second, and third resonance recesses(111,112,113) have semi-spherical shapes. A film(120) is coated on the first, second, and third resonance recesses(111,112,113). The film(120) is not coated on the lower surface of the dielectric body(110). The dielectric filter comprises first, second, and third trip portions(131,132,133), and input and output terminals(141,142)
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