Patent ID: 8461994

Claim:
A radio frequency receiver comprising: a first signal coupler coupling and branching a radio frequency signal received from a reader; a voltage regulator receiving the coupled signal and outputting a voltage regulated signal having a predetermined level; a signal converter mixing the radio frequency signal transmitted from the first signal coupler by using the voltage-regulated signal as an oscillation frequency signal, and generating a baseband frequency signal; a signal processor processing the baseband frequency signal and extracting tag information; and a data transceiver transmitting the tag information through a wire and/or wireless network; wherein the signal processor processes a signal received from the reader to generate reader information, and analyzes synchronization information comprising the reader information, wherein, if contents requesting leaked tag information exist as an analysis result of the synchronization information, the signal processor extracts the leaked tag information from a signal received from a tag by using the synchronization information, and wherein the signal received from the reader comprises: a first section and a fifth section, wherein the reader monitors in the first section and the fifth section whether or not the tag enters a communication area; a second section in which the reader transmits an information requesting signal; a third section in which the tag transmits a response signal according to the information requesting signal; and a fourth section in which the tag information is transmitted after the response signal has been transmitted.