Patent ID: 6954116

Claim:
A balanced-unbalanced converting circuit comprising: a first strip line having a first end and a second end, the second end of the first strip line being electrically connected with a ground; a second strip line having a first end and a second end, the second end of the second strip line being electrically connected with the ground; a first balanced terminal electrically connected with the first end of the first strip line; a first capacitor electrically connected between the first balanced terminal and the ground; a second balanced terminal electrically connected with the first end of the second strip line; a second capacitor electrically connected between the second balanced terminal and the ground; a third strip line having a first end and a second end; a fourth strip line having a first end and a second end, the second end of the fourth strip line being electrically connected with the second end of the third strip line; an unbalanced terminal electrically connected with the first end of the third strip line; a third capacitor electrically connected between the unbalanced terminal and the ground; and a fourth capacitor electrically connected between the first end of the fourth strip line and the ground; wherein 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.