Balanced-unbalanced converting circuit and laminated balanced-unbalanced converter

A laminated balanced-unbalanced converter comprising:

• first, second, third, and fourth strip lines each having a first end and a second end;
• first, second, third, and fourth capacitors;
• the first, second, third, and fourth strip lines and the first, second, third, and fourth capacitors being laminated via dielectric layers in a lamination direction to define a laminate;
• and
• first and second balanced terminals, an unbalanced terminal, a ground terminal, and an open terminal disposed on the laminate;
• wherein the first end of the first strip line is electrically connected with the first balanced terminal, the first end of the second strip line is electrically connected with the second balanced terminal, and the second end of the first strip line and the second end of the second strip line are electrically connected with the ground terminal;
• the first end of the third strip line is electrically connected with the unbalanced terminal, the first end of the fourth strip line is electrically connected with the open terminal, and the second end of the third strip line is electrically connected with the second end of the fourth strip line;
• the first capacitor is electrically connected between the first balanced terminal and the ground terminal, the second capacitor is electrically connected between the second balanced terminal and the ground terminal, the third capacitor is electrically connected between the unbalanced terminal and the ground terminal, and the fourth capacitor is electrically connected between the open terminal and the ground terminal;
• and
• the first end and the second end of the first strip line oppose the first end and the second end of the third strip line, respectively, so that the first strip line and the third strip line are electromagnetically coupled, and the first end and the second end of the second strip line oppose the first end and the second end of the fourth strip line, respectively, so that the second strip line and the fourth strip line are electromagnetically coupled.