Balance-unbalance converter and semiconductor integrated circuit having the same

A balance-unbalance converter for mutually converting a balanced signal and an unbalanced signal, comprising:

• a substrate;
• an unbalanced line formed on the substrate, the unbalanced line having a first end at which the unbalanced signal is input or output, and having a second end that is open;
• a first balanced line disposed on the substrate in parallel with a line portion of the unbalanced line from the first end to a midpoint of the unbalanced line, the first balanced line having a midpoint-side third end at which the balanced signal is output or input, and having a fourth end that is grounded;
• and
• a second balanced line disposed on the substrate in parallel with a line portion of the unbalanced line from the second end to the midpoint of the unbalanced line, the second balanced line having a midpoint-side fifth end at which the balanced signal is output or input, and having a sixth end that is grounded;
• wherein the unbalanced line is bent at the midpoint toward an opposite side of the first and second balanced lines.