RFID interrogation of liquid/metal
First Claim
1. A system for transmitting a low frequency radio frequency identification electro magnetic signal in a warehouse or distribution center environment;
- a system of aiming a radio frequency identification transmission antenna which is attached to an interrogator;
the function of which is to reduce signal to noise ratio within the warehouse or distribution center environment;
the further function of which is to take advantage of angle of attack and angle of incidence of physical properties associated with radio frequency identification interrogation of materials consisting of, or packaged with, liquid or metal.
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Abstract
A system to reduce signal to noise interference and reflection or absorption attenuation during an RFID interrogation conducted in a warehouse or distribution center environment containing items consisting of, or packaged in, metal or liquid. The system uses a printed tag intrinsic to the items to be interrogated. The interrogation is conducted at low frequency to maximize the benefits of the physical properties of low frequency electro magnetic transmissions in relationship to metal or liquid. Furthermore, the system uses laser calibrations to calculate the angle of incidence of the printed RFID transponders. This calculation is passed to an electric motor attached to the transmitting antenna of the RFID interrogator which is designed to aim the antenna. The function of this invention is to use the physical properties of metal and liquid in relationship to low frequency transmissions plus calibrated angle of incidence coefficients of transmitted electro magnetic signals and to co-ordinate same in order to maximum RFID interrogation power through a reduction of the signal to noise ratio.
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Citations
12 Claims
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1. A system for transmitting a low frequency radio frequency identification electro magnetic signal in a warehouse or distribution center environment;
- a system of aiming a radio frequency identification transmission antenna which is attached to an interrogator;
the function of which is to reduce signal to noise ratio within the warehouse or distribution center environment;
the further function of which is to take advantage of angle of attack and angle of incidence of physical properties associated with radio frequency identification interrogation of materials consisting of, or packaged with, liquid or metal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- a system of aiming a radio frequency identification transmission antenna which is attached to an interrogator;
Specification