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:
Mar. 17, 2009
Filed:
Sep. 25, 2006
Chan-soo Shin, Daejon, KR;
Won-kyu Choi, Daejon, KR;
Hae-won Son, Daejon, KR;
Gil-young Choi, Daejon, KR;
Cheol-sig Pyo, Daejon, KR;
Jong-suk Chae, Daejon, KR;
Han-phil Rhyu, Seoul, KR;
Sung-jun Heo, Seoul, KR;
Byung-je Lee, Seoul, KR;
Chan-Soo Shin, Daejon, KR;
Won-Kyu Choi, Daejon, KR;
Hae-Won Son, Daejon, KR;
Gil-Young Choi, Daejon, KR;
Cheol-Sig Pyo, Daejon, KR;
Jong-Suk Chae, Daejon, KR;
Han-Phil Rhyu, Seoul, KR;
Sung-Jun Heo, Seoul, KR;
Byung-Je Lee, Seoul, KR;
Electronics and Telecommunications Research Institute, Daejeon, KR;
Abstract
Provided is an antenna for a Radio Frequency Identification (RFID) reader using an electrical loop. It includes an upper metal plate which functions as a radiator; a lower metal plate which is disposed apart from the upper metal plate by a predetermined distance and functions as a radiator; a ground plate disposed apart from the lower metal plate by a predetermined distance; and a feeding probe disposed at the center of the upper and lower metal plates. The antenna can perform radiation parallel to the earth's surface including other directions. Therefore, it is suitable for an RFID reader which recognizes an RFID tag attached in parallel to the earth's surface. The electrical loop antenna can control impedance matching, resonance frequency, antenna gain, and radiation pattern according to the distance between metal plates, size of the metal plates, thickness of a feeding probe, and how the metal plates are arranged.