To provide a small-sized dielectric laminated filter with a low loss and a sufficient attenuation by connecting a filter circuit use pattern electrode to an earth electrode via a dielectric material in terms of circuit.
Input output terminal connection sections 8a, 9a reaching a side face and a coil-shaped pattern electrode in succession to them are provided to one side of a dielectric layer 2 and the coil-shaped pattern electrode form a band pass circuit. Furthermore, another coil-shaped pattern electrode is formed to the input output terminal connection sections 8a, 9a and the coil-shaped pattern electrode forms a notch circuit. A dielectric layer 3 is laminated on the dielectric layer 2, a dielectric layer 4 is laminated on the layer 3 and an earth pattern electrode 13 reaching both side faces is formed on the layer 4. On the other hand, a dielectric layer 1 is laminated under the dielectric layer 2, and pattern electrodes 5, 6, 7 or the like whose end reach a side face are formed on the upper side of the layer 1.
JP3344280 | DIELECTRIC FILTER AND DIELECTRIC DUPLEXER |
JPS5814601 | BAND PASS FILTER |
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