| CPC H03H 7/0115 (2013.01) [H01G 9/012 (2013.01); H01G 9/26 (2013.01)] | 7 Claims |
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1. A filter circuit comprising a resonant circuit, the resonant circuit including:
an input end;
an output end;
an inductance element electrically connecting between the input end and the output end; and
a capacitor electrically connecting between the inductance element and a conductor that is at a reference potential, wherein:
the capacitor is an electrolytic capacitor, and
the capacitor includes:
an element stacked body that is a stack of a plurality of capacitor elements,
an exterior body that includes a sealing member covering the element stacked body,
a first external electrode and a second external electrode that are electrically connected to the inductance element, and
a third external electrode electrically connected to the conductor that is at the reference potential,
each of the plurality of capacitor elements includes:
an anode body including a porous part on a surface of the anode body,
a dielectric layer disposed on a surface of at least a part of the porous part, and
a cathode part covering at least a part of the dielectric layer,
in a first end portion of the each of the plurality of capacitor elements, the anode body is exposed from the exterior body, and
in a second end portion of the each of the plurality of capacitor elements, the anode body is covered by the cathode part,
the plurality of capacitor elements include a first capacitor element with the first end portion electrically connected to the first external electrode, and a second capacitor element with the first end portion electrically connected to the second external electrode, and
the third external electrode is electrically connected to the cathode part of the capacitor element.
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