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:
Dec. 20, 2011
Filed:
Dec. 29, 2005
Hae-won Son, Daejeon, KR;
Won-kyu Choi, Daejeon, KR;
Chan-soo Shin, Daejeon, KR;
Gil-young Choi, Daejeon, KR;
Cheol-sig Pyo, Daejeon, KR;
Hae-Won Son, Daejeon, KR;
Won-Kyu Choi, Daejeon, KR;
Chan-Soo Shin, Daejeon, KR;
Gil-Young Choi, Daejeon, KR;
Cheol-Sig Pyo, Daejeon, KR;
Abstract
Provided is an antenna system with high isolation. The high-isolation antenna has transmission ports of a transmission antenna and reception ports of a reception antenna highly isolated from each other by using quadrature hybrid couplers. The antenna system includes: a transmission antenna having two feed points for transmitting signals; a reception antenna having two feed points for receiving signals; a transmission hybrid coupler which is connected to the two feed points of the transmission antenna and transmits transmission signals which have a phase difference of 90° with each other; and a reception hybrid coupler which is connected to the two feed points of the reception antenna and receives reception signals which have a phase difference of 90° with each other. The signals leaking from the two feed points of the transmission antenna to the two feed points of the reception antenna are offset.