The hottest RFID exploration actively develops the

RFID exploration: actively develop the next generation RFID technology

RFID technology has developed rapidly in many fields. It is undeniable that EPC Gen 2 label has excellent applicability when pasted on cargo containers and pallets, but there is still more work to be done

meet the requirements of UHF RFID

the initial requirements for passive UHF tags are: in a long working distance, at least the North American radio regulations can meet the requirements of reading the turnover box on the pallet, even if they can't see, regardless of the surrounding environment. At present, this goal has not been achieved. But this year, Tyco ADT reported that using UHF to read the turnover boxes hidden in the cargo pile is no longer an insurmountable difficulty. At olso gardenmoen International Airport, accu sort uses air packaging to separate each bag one by one to ensure good data reading performance. San Fransisco International Airport relies on the RFID reader newly developed by quatrotec company to obtain excellent data reading performance. At the same time, the continuous adjustment of operability can solve other problems, such as the interference between different readers and writers

at present, UHF RFID technology can achieve a data reading and writing distance of one meter to several meters by using far-field technology. The different characteristics of the installation site lead to the emergence of various antennas, such as flag type, cross type, sword type, wave type and other strange styles. Avery Dennison claims that its products can meet a variety of requirements. However, no supplier can provide antennas suitable for all situations. For a given environment, it is impossible to determine which antenna shape is most suitable. In this case, it is difficult to call it a mature technology, at least it needs a lot of technological upgrading and improvement

redefinition in the field of single product identification

in order to compete with the most popular RFID frequency, which is widely used in article level labels by many pharmaceutical companies, UHF promoters have gradually stopped using far-field technology to seize the single product label market. This market ranks third after smart cards and animal tags, and is far ahead of the pallet and container level label market in terms of market value. There is no doubt that there are great risks

they hope to promote near-field UHF technology in the single product market in the next strategy. This technology has not been used on such a large scale, but it can be believed that the antenna cost of this tag is lower, because it only needs one conversion rather than seven conversions of high-frequency RFID. Near field UHF can also be used in water and metal environment like HF, because both of them have sensing ability. In addition, a unified antenna shape can be used in all applications

gradually adopt near-field UHF technology

the development of near-field recognition technology will be gradual, because UHF readers and writers are more expensive than HF, and it is still unclear how much profit they can bring. Therefore, high-frequency RFID is likely to become a worldwide popular RFID frequency, while UHF RFID has to go a long way. The signal protocols around the world are different from each other, which affects the overall performance and standards. You can see that general electromechanical devices have an inertia value standardization, which cannot achieve the purpose of cost reduction

hf labels have also made significant progress. High frequency RFID system can read the tag information hidden in goods well, but the cost of long-distance HF tag is too high. At present, UHF is still a standard solution in Western long-distance applications

active RFID accounts for 20% of the RFID market. Like active RFID, the production cost of semi-active tags, other types of RFID tags and smart cards with embedded sensors need to be reduced. WiFi technology has made breakthroughs in real-time positioning systems, but there are still many problems to be solved, such as working only 70% of the time, and the accuracy needs to be improved. RTLS real-time positioning labels will have a broad market, but there is no relevant product in the market. Wavetrend active RFID system can monitor assets several kilometers away. Whernet integrated RTLS system has not yet provided small tags for indoor asset management

chip free RFID coreless RFID tags refer to RFID tags that do not contain silicon chips. The main potential advantage of coreless labels is that they can eventually be printed directly on products and packages at a cost of 0.1 cents, replacing the 100 billion bar codes used every year with more flexible and reliable features

the mainstream of coreless labels are those that can be digitally decoded and have a working range of more than one millimeter, which are similar to silicon chips. Because coreless labels have some other characteristics besides low price, their potential market competitiveness exceeds that of low-cost and high-capacity labels. In fact, the price of coreless labels is lower than that of silicon chip labels in most cases. The unique characteristics of chip free RFID technology can solve the main problems of RFID: it still has reliable readability when the distance between the tag and the reader is large (RF ID radio frequency express note: in occasions, it can replace passive tags and active tags); Overcome the problem that liquids and metals hinder the reading of signals, as well as the complete reading of pallets (RFID radio frequency express note: This is an extremely important RFID capability)

working principle of saw tag

saw tag can be regarded as the second generation of coreless RFID tag, which is composed of interdigital transducer and several reflectors. The two buses of the transducer are connected with the antenna of the electronic tag. The antenna of the RFID reader sends high-frequency interrogation pulses periodically. Within the receiving range of the electronic tag antenna, the received high-frequency pulses are converted into surface acoustic waves through the interdigital transducer and propagate on the crystal surface. The reflector group partially reflects the incident surface wave and returns to the interdigital transducer, which in turn converts the reflected acoustic pulse train into a high-frequency electrical pulse train. If the reflector group is designed according to a specific law, so that its reflected signal represents the specified coding information, then the reflected high-frequency electric pulse string received by the reader/writer carries the specific code of the item. Through demodulation and processing, the term shoelace is actually familiar to each of us for the purpose of automatic recognition. Therefore, the RFID system based on SAW technology can measure the tag location, running direction, tag temperature and other factors. In addition, saw labels can withstand the test of safety and safety related processes - including high temperature, high-energy X-ray or gamma ray sterilization, etc. - and are suitable for use in food or drug supply chains

this year, the logistics industry and military departments placed a number of large orders for saw labels. Without the limitation of threshold voltage, saw tags can work in a wider temperature range, but the cost is still relatively high. It will take about a year to solve the problem of printing RFID circuits directly, and the research of embedded technology will wait for several years. At the same time, companies such as Swedish technology R & D institutions acreo, M-real and somark innovation will continue to study printing RFID on items. This method can reduce the cost to 0.1 cents, so the cost of applying it to bulk goods will not be too high

in a word, it is meaningful to explore and study the next generation RFID technology, which will make RFID more universal and practical to reach the goal of controlling the movement of the beam (Wen/Fei)

reprinted from: RFID radio frequency express Fay

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