| 摘要 |
An asset tracking system includes one or more RFID readers and one or more RFID tags cooperating with the readers, and at least one garment, wherein the readers each include an RF wideband transceiver and a linearly polarized antenna. Each reader polls periodically a corresponding one or more RFID tag to determine a distance of a particular tag from each reader. Each reader computes the tag's distance in real-time and updates a corresponding database in real-time for an on-demand reaction as determined by a processor in each reader. Each tag includes a wideband transceiver and an antenna array. The antenna array is implanted on each garment and ensures a spherical coverage around each tag. The antenna array includes two or more patch antenna distributed around each garment so as to provide full 360 degree and spherical coverage around each garment, and wherein each patch antenna is provided on a dielectric. Coverage is thereby provided by the patch antenna array and removes the need of having a single line of sight. Each tag may include an on-board processor adapted to adaptively switch between the antennas in the antenna array so as to select an appropriate antenna of the array for a signal from a corresponding reader. |
