Patent ID: 7595703
Filing Date: 2009-09-29
Classification: H01P

Abstract:
1. A balun comprising: an input terminal, a coupled line connected to the input terminal, and a first output terminal and a second output terminal connected to the coupled line, the coupled line including: a first unbalanced line connected to the input terminal, a second unbalanced line connected to the first unbalanced line by folding back with an open end connected to ground, a first balanced line connected between the ground and the first output terminal, a second balanced line connected between the ground and the second output terminal; wherein the first balanced line and the second balanced line are disposed substantially on the same plane, the first unbalanced line is disposed above the first balanced line at a predetermined distance from the first balanced line, and the second unbalanced line is disposed below the second balanced line at the predetermined distance from the second balanced line.