| CPC H03H 7/0115 (2013.01) [H01F 17/0013 (2013.01); H01G 4/40 (2013.01); H03H 7/1708 (2013.01); H03H 7/1775 (2013.01); H01F 2017/0026 (2013.01); H03H 2001/0085 (2013.01)] | 20 Claims |
|
1. A multilayer LC filter to transfer a signal from an input terminal to an output terminal, the multilayer LC filter comprising:
a multilayer body in which multiple dielectric layers are laminated; and
multiple LC parallel resonators provided in the multilayer body and electromagnetically coupled to each other; wherein
in at least one of the multiple LC parallel resonators:
on one of the dielectric layers between ones of the dielectric layers on which a capacitor conductor pattern and a ground conductor pattern of a capacitor of the at least one of the multiple LC parallel resonators are respectively provided, an adjustment capacitor conductor pattern is provided to adjust a capacitance of the capacitor; and
the adjustment capacitor conductor pattern is connected to either the capacitor conductor pattern or the ground conductor pattern by a via conductor;
the multilayer body includes:
a first line-shaped conductor pattern, a second line-shaped conductor pattern, and a third line-shaped conductor pattern between adjacent ones of the dielectric layers;
a first capacitor conductor pattern, a second capacitor conductor pattern, and a third capacitor conductor pattern between adjacent ones of the dielectric layers; and
at least one ground conductor pattern between adjacent ones of the dielectric layers;
the multiple LC parallel resonators include a first LC parallel resonator, a second LC parallel resonator, and a third LC parallel resonator;
the first LC parallel resonator includes the first line-shaped conductor pattern, a first open via conductor connecting the first line-shaped conductor pattern and the first capacitor conductor pattern, and a first short-circuit via conductor connecting the first line-shaped conductor pattern and the at least one ground conductor pattern;
the second LC parallel resonator includes the second line-shaped conductor pattern, a second open via conductor connecting the second line-shaped conductor pattern and the second capacitor conductor pattern, and a second short-circuit via conductor connecting the second line-shaped conductor pattern and the at least one ground conductor pattern;
the third LC parallel resonator includes the third line-shaped conductor pattern, a third open via conductor connecting the third line-shaped conductor pattern and the third capacitor conductor pattern, and a third short-circuit via conductor connecting the third line-shaped conductor pattern and the at least one ground conductor pattern; and
when the multilayer body is seen through in a height direction of the multilayer body:
the first open via conductor is closer to the second open via conductor than to the second short-circuit via conductor and closer to the third open via conductor than to the third short-circuit via conductor; and
the second open via conductor is closer to the third open via conductor than to the third short-circuit via conductor.
|