| CPC H03H 7/1708 (2013.01) [H03H 7/0115 (2013.01); H03H 7/1775 (2013.01)] | 8 Claims |
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1. A filter device comprising:
a multilayer body including a stack of a plurality of dielectric layers, a first surface and a second surface;
an input terminal, an output terminal, and a ground terminal at the second surface of the multilayer body;
a common electrode closer to the first surface than to the second surface in the multilayer body;
a ground electrode coupled to the ground terminal;
a first resonator and a second resonator in a layer between the common electrode and the ground electrode;
a shield electrode closer to the first surface than the common electrode and covering the entire common electrode when viewed in plan view in a stacking direction of the multilayer body;
a first ground via coupling the shield electrode and the ground electrode via the common electrode; and
a second ground via directly coupling the shield electrode and the ground electrode without passing the common electrode;
the first resonator including:
a first via including one end coupled to the common electrode and another end coupled to the input terminal; and
a first plate electrode coupled to the first via and at least partially overlapping the ground electrode when viewed in plan view in the stacking direction;
the second resonator including:
a second via including one end coupled to the common electrode and another end coupled to the output terminal; and
a second plate electrode coupled to the second via and at least partially overlapping the ground electrode when viewed in plan view in the stacking direction.
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