Patent ID: 8525647

Claim:
A measuring system for detecting radio-frequency tags operating at a predefined wavelength, the system comprising a reading device and an antenna, which is connected to the reading device for connecting to one or more radio-frequency identifier (RFID) tags moving in a direction towards said antenna, wherein the antenna has a microstrip configuration and a length which is equal to or longer than a multiple of said predefined wavelength of the one or more RFID tags in order to form a leaky waveguide and an elongated detection zone, said leaky waveguide having the microstrip configuration acting as both a transmission and a reception antenna and being connected to the reading device in order to produce a radio-frequency excitation signal and in order to receive from said one or more RFID tags crossing said elongated detection zone, a return signal powered by the radio-frequency excitation signal, and wherein the antenna comprises: a long conductor configured like a wire, an elongated ground plane in the vicinity of the long conductor and essentially parallel to the long conductor in order to form said elongated detection zone, and wherein the long conductor is connected at one end to the elongated ground plane.