Antenna, apparatus and method for identifying and tracking multiple items
A flat identification antenna for receiving signals from multiple tag-carrying items placed on the antenna and a system for identifying and tracking multiple tag-carrying items including the same. The antenna comprises a first planar array of partially overlapping first planar loops, a second planar array of partially overlapping second planar loops and an insulating board positioned between the first and second arrays. The loops in the first array are arranged to partially overlap each other in one direction and the loops in the second array are arranged to partially overlap each other in another direction.
1. A flat identification antenna for receiving signals from a tag attached to an item placed on the antenna, the antenna comprising an antenna core, the antenna core comprising:
a first planar array comprising a plurality of first discrete planar loops made of conductive material, said plurality of first loops are arranged so as to partially overlap each other in a first direction;
a second planar array parallel to said first planar array, the second array comprising a plurality of second discrete planar loops made of conductive material, said plurality of second loops are arranged so as to partially overlap each other in a second direction different from the first direction; and
an insulating board positioned between said first and second arrays.
2. The antenna of claim 1 wherein said first and second directions are orthogonal to each other.
3. The antenna of claim 1 further comprising a flat conductive board positioned beneath and in parallel to said antenna core and a spacing layer for keeping a constant distance between said antenna core and said conductive board.
4. The antenna of claim 3 wherein the spacing layer comprises crisscross spacing elements.
5. The antenna of claim 3 wherein the conductive board comprises an FR4 board covered with a conductive layer on its upper and lower planes.
6. The antenna of claim 1 wherein each two adjacent loops in said first and second arrays overlap each other by about 20 to about 50 percent.
7. The antenna of claim 1 wherein the first array is attached to one surface of the insulating board and the second array is attached to an opposite surface of the insulating board.
8. The antenna of claim 1 wherein the antenna emits a signal having a radio frequency, and the tag is a Radio Frequency Identification (RFID) tag.
9. The antenna of claim 1 wherein the antenna is of a rectangular shape defined by a first dimension and a second dimension and wherein said first and second planar loops are of a rectangular shape, the first planar loops having one dimension equals to the first dimension of the rectangular antenna and partially overlapping each other in a direction parallel to the second dimension of the rectangular antenna and the second planar loops having one dimension equals to the second dimension of the rectangular antenna and partially overlapping each other in a direction parallel to the first dimension of the rectangular antenna.
10. The antenna of claim 1 further comprising an insulating top cover and base cover.
11. The antenna of claim 1 wherein each of said first and second planar loops comprises a capacitor.
12. The antenna of claim 1 wherein the flat antenna is dimensioned to conform to the dimensions of an operation room instrument table, of an instrument tray, or of a table top of a Mayo.
13. The antenna of claim 1 wherein information regarding the tag is transferred by the antenna to a reader and wherein information from the reader is transferred to a computing platform.
14. A system for identifying and tracking multiple tag-carrying items comprising one or more antennas as defined in claim 1 .
15. The system of claim 14 further comprising one or more readers coupled to said one or more antennas and a computing platform configured to execute one or more applications configured to track and identify said tag-carrying items, to store and maintain a database regarding said items and to allow a user to access said database.