Multiplexer, filter, and communication module

A filter comprising:

• a multilayered body including a plurality of dielectric layers stacked in a vertical stacking direction;
• a first signal terminal, a second signal terminal, and a ground terminal that are disposed on a surface of the multilayered body, the first signal terminal being to be electrically connected to an antenna;
• a first inductor constructed within the multilayered body, disposed in an electrical path connecting the first signal terminal to the second signal terminal;
• and
• a second inductor constructed within the multilayered body, connected in series with the first inductor along said electrical path between the first inductor and the second signal terminal, at least a part of the second inductor overlapping with at least a part of the first inductor in the stacking direction, a capacitance formed between a first end of the second inductor connected to the first inductor and the ground terminal being larger than a capacitance formed between a first end of the first inductor that is closer to the first signal terminal along said electrical path and the ground terminal.

A multiplexer comprising:

• a multilayered body including a plurality of dielectric layers each having a conductive pattern or patters thereon, stacked in a vertical staking direction;
• a common terminal, a first terminal, a second terminal, and a ground terminal that are disposed on a bottom surface of the multilayered body;
• a first filter constructed of a set of the conductive patterns on the plurality of dielectric layers in the multilayered body and electrically connected between the common terminal and the first terminal;
• and
• a second filter constructed of another set of the conductive patterns on the plurality of dielectric layers in the multilayered body, the second filter including:
• a first inductor formed in the multilayered body, one end of the first inductor being connected to the common terminal;
• a second inductor formed in the multilayered body having one end thereof connected to another end of the first inductor so as to be connected in series with the first inductor, another end of the second inductor being connected to the second terminal, the second inductor being formed in a layer or layers that are above a layer or layers in which the first inductor is formed such that the second inductor at least partially overlaps with the first inductor in a plan view;
• and
• a capacitor formed in the multilayered body, connected between the ground terminal and a node that connects the first inductor and the second inductor in series, the capacitor being formed in layers that are below the layer or layers in which the first inductor is formed, and having a capacitance that is greater than a capacitance formed between the ground terminal and said one end of the first inductor connected to the common terminal, said capacitance formed between the ground terminal and said one end of the first inductor being formed only by a parasitic capacitance formed within the multilayered body, or formed by another capacitor physically formed within the multilayered body, connected between the ground terminal and said one end of the first inductor.