Tham khảo tài liệu 'current trends and challenges in rfid part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 200 Current Trends and Challenges in RFID Results are quite relevant despite the very good values obtained in case of alignment in general it emerges that no tag guarantees satisfactory performance levels in both cases and for each orientation. Fig. 11. A performance comparison on the items line by varying tag type and the tag-reader antenna misalignment in presence of liquids and metals ophthalmic solution . Even more interesting are the results obtained by testing the tags in the cases line. As an example Fig. 13 and Fig. 14 reports the successful read rate evaluated by packing together 36 secondary packages of ophthalmic solution and 14 of bomb spray respectively in the three configuration previously described and named respectively Configuration I Configuration II and Configuration III. It can be observed that the strong presence of metal and liquid substantially inhibits the communication between reader and the NF tags. Moreover also when FF tags are considered very low performance are obtained in each configuration demonstrating once more that general purpose commercial tags are not appropriate for the implementation of complex item level tracing systems. It is substantially due to the fact that such tags have been designed not taking into account the peculiarities of the scenario where they must be utilized. Fig. 12. A performance comparison on the items line by varying tag type and the tag-reader antenna misalignment in presence of metals Bomb spray . 201 High Performance UHF RFID Tags for Item-Level Tracing Systems in Critical Supply Chains Fig. 13. A performance comparison on the cases line by varying tag type and the homogenous case composition in presence of liquids and metals ophthalmic solution . In the next section a requirement analysis for a tag appositely designed to work in a complex supply chain such as the pharmaceutical one are individuated and described and are used to drive the development of a new high performance UHF RFID tag. 5. .
