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:
Oct. 09, 2012
Filed:
Nov. 28, 2007
Jong-rim Lee, Seoul, KR;
Sang-yun Hwang, Seoul, KR;
Chul-jin Kim, Yongin-si, KR;
June-hyeok Im, Seoul, KR;
Hyun-kuk Choi, Seoul, KR;
Chul-hyun Park, Suwon-si, KR;
Jong-Rim Lee, Seoul, KR;
Sang-Yun Hwang, Seoul, KR;
Chul-Jin Kim, Yongin-si, KR;
June-Hyeok Im, Seoul, KR;
Hyun-Kuk Choi, Seoul, KR;
Chul-Hyun Park, Suwon-si, KR;
Abstract
Disclosed is an apparatus and method for signal detection according to frequency bands used in an RFID system. The apparatus includes a low-noise amplifier for low-noise amplifying a received signal, a receiver unit for detecting a CW signal and a tag signal, a transmitter unit for frequency up-converting and outputting an input signal, a PLL for generating a frequency signal according to a transmission signal band or a reception signal band, a receiver unit switch for connecting the receiver unit with the low-noise amplifier or a directional coupler, an antennas switch for connecting the antenna with the directional coupler or low-noise amplifier, and a controller unit for controlling a frequency of the frequency signal generated by the PLL, turning off transmission power in a case of an LBT scheme, controlling the receiver unit switch and the antenna switch, and determining if a corresponding channel is an idle channel.