Laminated balanced filter

A laminated balanced filter comprising:

• a laminated body including a plurality of dielectric layers and a plurality of electrode patterns located on the dielectric layers;
• one unbalanced terminal;
• two balanced terminals;
• a ground terminal;
• an unbalanced-side LC parallel resonator including one end portion connected to the ground terminal and another end portion connected to the unbalanced terminal;
• a balanced-side inductor including two end portions that are individually connected to the balanced terminals;
• and
• at least one intermediate LC parallel resonator including one end portion connected to the ground terminal and disposed between the unbalanced-side LC parallel resonator and the balanced-side inductor;
• wherein
• the unbalanced-side LC parallel resonator and an intermediate LC parallel resonator disposed nearest to the unbalanced-side LC parallel resonator among the intermediate LC parallel resonators are electromagnetic-field-coupled to each other;
• the balanced-side inductor and an intermediate LC parallel resonator disposed nearest to the balanced-side inductor among the intermediate LC parallel resonators are electromagnetic-field-coupled to each other;
• the unbalanced terminal, the balanced terminal, and the ground terminal are provided on the laminated body;
• the balanced-side inductor includes an inductor electrode pattern on a predetermined dielectric layer of the laminated body, wherein a connection portion in a central portion or approximately central portion of the inductor electrode pattern is connected to the ground terminal and includes a first portion extending from one end portion thereof to the connection portion and a second portion extending from the other end portion thereof to the connection portion;
• the intermediate LC parallel resonator includes an inductor electrode pattern on a layer of the laminated body and that is different from the inductor electrode pattern of the balanced-side inductor;
• a direction of a current flowing through the first portion of the inductor electrode pattern of the balanced-side inductor is opposite to a direction of a current flowing through the inductor electrode pattern of the intermediate LC parallel resonator and a direction of a current flowing through the second portion of the inductor electrode pattern of the balanced-side inductor is the same as the direction of the current flowing through the inductor electrode pattern of the intermediate LC parallel resonator;
• and
• the laminated balanced filter further includes a coupling capacitor connected between the balanced terminal connected to the first portion side and the unbalanced terminal.