Patent 7205861 was granted and assigned to Taiyo Yuden on April, 2007 by the United States Patent and Trademark Office.
A balun device provides a more suitable technique for a broader band application which has been difficult for conventional baluns. The balun device has a balun unit, which is provided with a balanced line and an unbalanced line, and a matching circuit connected to the unbalanced line, wherein the matching circuit is composed of a high-pass filter.