The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 08, 2008
Filed:
Aug. 04, 2006
Seok Bong Hyun, Daejeon, KR;
Kyung Hwan Park, Daejeon, KR;
Tae Young Kang, Seoul, KR;
Seong Su Park, Daejeon, KR;
Seok Bong Hyun, Daejeon, KR;
Kyung Hwan Park, Daejeon, KR;
Tae Young Kang, Seoul, KR;
Seong Su Park, Daejeon, KR;
Electronics and Telecommunications Research Institute, Daejeon, KR;
Abstract
Provided are a digitally controlled circulator and a radio frequency identification (RFID) reader having the circulator. A power splitter is composed of lumped elements and the values of the elements are digitally changed using switching means, in which the transmission loss of a signal is controlled according to whether the reader is in a transmission state or a reception state. Therefore, the loss can be minimized, and the circulator can be miniaturized and priced down by an integrated circuit (IC) semiconductor process and mounted in a mobile terminal such as a cellular phone.