Filter component
AssigneeMurata Manufacturing Co., Ltd.
InventorMasahiro Teramoto
Life of this patent
Estimating the term…
Abstract
In a filter component with improved attenuation characteristics for common mode noise, an LC series resonance circuit disposed in each of a plurality of shunt circuits is connected at a first end to a first line and is grounded at a second end. The LC series resonance circuit disposed in each of the shunt circuits is grounded at a first end and is connected at a second end to a second line. With this configuration, the LC series resonance circuits resonate reliably so as to define attenuation poles. Accordingly, the resonant frequency of each of the LC series resonance circuits is set to be a frequency that effectively attenuates common mode noise.
Claims14
A filter component comprising:
- first and second differential input terminals;
- first and second differential output terminals;
- a first filter circuit that is disposed on a first line between the first differential input terminal and the first differential output terminal;
- a second filter circuit that is disposed on a second line between the second differential input terminal and the second differential output terminal;
- a shunt circuit that connects the first line and the second line with each other;
- and
- a multilayer substrate including a plurality of insulating layers stacked on each other, the first and second filter circuits and the shunt circuit being disposed in the multilayer substrate;
- wherein
- the first and second filter circuits are disposed on a first side of the multilayer substrate, and the shunt circuit is disposed on a second side of the multilayer substrate;
- the first filter circuit includes a first LC parallel resonance circuit;
- the second filter circuit includes a second LC parallel resonance circuit;
- the shunt circuit includes:
- a first LC series resonance circuit that is connected at a first end thereof to the first line;
- and
- a second LC series resonance circuit that is connected at a first end thereof to a second end of the first LC series resonance circuit and connected at a second end thereof to the second line;
- wherein
- a node between the first and second LC series resonance circuits is grounded;
- the node is located at a midpoint of the shunt circuit;
- and
- an inductance of a first inductor included in the first LC series resonance circuit and an inductance of a second inductor included in the second LC series resonance circuit are identical to each other.
Dependencies are inferred from the claim text.