High Performance Uhf Rfid Tag Antennas on Liquid-Filled Bottles

Abstract

It is challenging to design a high-performance UHF RFID tag antenna on a liquid-filled bottle due to the high conductivity, high permittivity, and the variety of liquids. A systematic way how to design a high-performance UHF RFID tag antenna on a liquid-filled bottle is presented. A simple design consisting of a folded dipole and a loop matching structure is first proposed for a tag antenna placed on a water bottle. A co-design approach is adopted to make the water and bottle surface become a part of the tag antenna to eliminate the significant influence of the environment. The measurement results at 915 MHz show that the reading range of the simple design can reach 8 m in the absence of the water bottle and reach 4.2 m when it is placed on a water bottle. The folded dipole on the water bottle is then optimized to improve the gain significantly, and a maximum gain of −5.54 dBi is achieved at 915 MHz. Furthermore, the impedance bandwidth for the tag antenna on the water bottle is greatly improved by increasing the number of loops in the impedance matching structure from one to three, and the −6 dB impedance bandwidth of over 100 MHz (simulation) or 84 MHz (experiment) is achieved. A reading range of 5.6 m is achieved when the tag antenna is placed on a water bottle at 915 MHz.

Making assembly line in supply chain robust and secure using UHF RFID

“…Table 2 shows a comparison of the proposed RFID tag antenna with state of the art. The tag antenna design in 6 covers 5.6 m read range, however, it is etched on costly polyimide substrate. Moreover, the read range measured was only for one plastic bottle.…”

“…This challenge is magnified further due to the low-cost requirements for bulk tagging. To deal with this problem, researchers have worked in the past where a UHF RFID tag antenna was proposed for liquid-filled plastic bottles in 6 . This tag antenna utilized a folded dipole and loop matching technique to get a read range of 4.2 m after mounting it on a plastic water bottle.…”

Iterative technique for analysis and design of circular leaky‐wave antenna for the 2.45‐GHz radio‐frequency identification applications

“…Repeat step 2 to step 5 until the convergence of the network parameters are obtained. After testing the convergence at the k iterations, the tangential electric field and current density in the discontinuity using Equations ( 9) and (10), can be written as:…”

“…and have not been very successful in their intended requirement. Our objective is, therefore, to design miniature microstrip antenna structures for radio‐frequency identification (RFID) readers in the UHF band with the correct performance …”

“…Our objective is, therefore, to design miniature microstrip antenna structures for radio-frequency identification (RFID) readers in the UHF band with the correct performance. [9][10][11] On the other hand, the rigorous analysis and design of microwave circuits require first of all an accurate resolution of the electromagnetic equations in order to reconstruct the real behaviour of the electromagnetic field in the RF structure.…”