Patent ID: 7692512
Filing Date: 2010-04-06
Classification: H01P

Abstract:
1. A balun comprising: a circuit ground; a first transmission line including a first conductor having a first end forming a first unbalanced-signal port relative to the circuit ground, and a second conductor inductively coupled to the first conductor; a second transmission line including a third conductor inductively coupled to the second conductor and having a first end forming a first balanced-signal port; a third transmission line electrically spaced from the second transmission line and including a fourth conductor having a first end connected to a second end of the third conductor and a second end forming a second balanced-signal port, and a fifth conductor inductively coupled to the fourth conductor; a fourth transmission line having a sixth conductor and a seventh conductor, the sixth conductor having a first end connected to a second end of the first conductor, and the seventh conductor inductively coupled to the sixth conductor and having a first end proximate the first end of the sixth conductor and a second end forming a third balanced-signal port; and a fifth transmission line having an eighth conductor and a ninth conductor, the eighth conductor having a first end connected to a first end of the fifth conductor, and the ninth conductor having a first end proximate the first end of the eighth conductor and connected to the first end of the of the seventh conductor, and the ninth conductor being inductively coupled to the eighth conductor and having a second end forming a fourth balanced-signal port.