Latest development of the hottest RFID Technology

2022-08-06
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The latest development of RFID technology collection

the new development of RFID technology includes long-distance non UHF tags, which can be applied to RFID equipment with difficult substrate treatment and RFID tags that can resist the sterilization process. This article will tell you what this means for food, medicine and other important markets

it is well known that in the case of radio frequency regulation in most countries, RFID cannot function beyond the range of more than 1 meter, unless UHF (ultra-high frequency, i.e. the license free frequency of about 900MHz) is used. If a battery is installed in the RFID tag, a longer reading and writing range can be achieved. This is also a feasible solution for vehicles. However, these so-called active tags have limited service life, are more expensive, their size is relatively large, and there are more components that may cause errors. Therefore, according to the requirements of leading retailers in the United States and Europe and the U.S. military, UHF Passive tags are used as standardized RFID tags for packaging cases and pallets of food and other products

uhf RFID is not suitable for all food applications

however, although the performance of UHF RFID is good (in fact, it has been used as an ear mounted tracking tag for cows), if there is a water or metal environment nearby, its results may be difficult to predict. As the Hong Kong Airport (using this tag to track baggage) and the German retailer Metro (using this tag on food) have found, sometimes it can not be read because of the proximity of water or metal. In other cases, unexpected and annoying reading phenomena will occur at a distance of 50 meters, causing the reader to confuse the tags to be read. In Europe, the military and other vested interests are also preventing UHF Wireless specifiers from approving higher power and bandwidth, which greatly limits the scope and control of the interface between the reader on the pallet and the food packaging box. The industry will soon improve the UHF system, but the recent substantial improvement of the traditional HF (high frequency, 13.56MHz) and microwave (2.45GHz) systems makes them more suitable for tracking applications

these improvements include:

◆ the reading distance of HF tag with password protection function is more controllable, and the tolerance to water and metal is higher than that of UHF tag. Major retailers require password protection for reading. 3. Significant security advantage: writing labels. Only UHF labels that use the EPC standard have this function

◆ a new method is adopted to expand the reading distance of HF RFID tag, sometimes up to 10 meters

◆ replace silicon chip in RFID tag with surface acoustic wave chip. These surface acoustic wave chips have no limitation of voltage range. They can sense temperature without additional sensors and are easier to manufacture

HF label with password protection

texas instruments recently released a HF label with password protection function and standard writing mechanism and a production process with strict quality control regulations. In addition, it also provides a unique solution for pharmaceutical labels (also related to food)

this helps to solve another problem in the pharmaceutical supply chain: privacy. Different from retailing and fast-moving consumer goods, the pharmaceutical industry has reached a consensus that drug labels should not lose their function after being purchased by consumers. In fact, Nestle and other food companies have also said that it is neither feasible nor necessary to disable it. One of the key potential benefits of using RFID tags on drugs is that it can greatly improve the efficiency of the recall process, which will require the identification information to be retained on the labels of returned drug bottles. Of course, the problem caused by this is that if the label is not invalidated, the privacy of consumers may be affected. Medical prescriptions may be very sensitive personal information. Consumers do not want hackers to steal the name of the drugs they buy when they leave the drugstore

the write function with password protection provides a solution. In all links of the whole supply chain, the product information and serial number of traditional Chinese medicine will be stored on the label until the bottle arrives at the drugstore. In the drugstore, the product information will be completely deleted, but the serial number will still be retained. Therefore, even if a hacker successfully reads the label, he can only get some serial numbers, but he cannot know the specific names of these drugs. In addition, in case of recall, consumers can return the drug bottle with label to the drugstore, and then the serial number of the drug bottle label will enter the system and find the product information it represents, so as to determine whether it should be recalled. Finally, a single food grade label in a supermarket also needs to remain valid after being purchased. IDTechEx believes that the potential benefits and rewards of keeping the drug label effective after purchase include better recall effect, fewer errors and convenience for lottery for consumers

HF RFID with longer reading distance

what if Iceland hydraulic universal testing machine suddenly loses power? The fishery company has successfully tried HF RFID tags on the pallets and packaging boxes of fish products with more moisture, because UHF tags are difficult to play a role in this situation. However, the reading distance of HF tags the size of ordinary credit cards is only 1 meter. The company hopes that this distance can be longer. Those who think that the overall cost of HF system should be lower even think that it should be two meters. For example, contrary to UHF, HF labels do not require a large amount of royalties, and the HF labels that have been manufactured in the market are ten times as many as UHF, which has a certain economies of scale. Of course, the number of UHF is also increasing rapidly

achieve a longer reading distance of HF

there are many ways to achieve a longer reading distance of HF without a large label and reader. Metro is one of the largest supermarket chains in the world. They hope to use the same frequency and standard on the label of a single product level if possible. For short-distance smart shelves, HF seems to be the best way, because in a short distance, its label is the smallest and controllable (you can clearly know the reading distance you are getting), so there will be no product confusion. The UHF label may not be appropriate, and it is too large for small-size foods. For large-scale products, Metro's approach is not to make HF labels very large, but to use some large inquiry antennas like anti-theft bases in stores. Japan's maruetsu company has adopted a similar approach in its food chain stores

large size labels

some companies have adopted large size HF labels and more appropriate interrogators. For example, in the recent experiment, DHL's express label covered the whole package. This test provided by denstron was successful, and the company received a US $1billion invitation to bid, which dwarfed the UHF pallet/box label. This scheme complies with epc/iso standards. (there is a legend that you can't make ISO compliant labels with HF, and ask and other companies are pleased to launch this product.). A large HF tag with a reading distance of two meters is not a new idea. For example, UPM Rafsec company in Finland has long provided a large HF tag with the size of A5 paper for pasting on the chest of marathon runners. Miyake company of Japan has already applied a large number of A5 size HF tags to the pipeline. These tags use a frequency of about 13.56MHz and can penetrate two meters of soil layer

for smaller HF tags over long distances

however, these "large antenna" schemes require high production capacity, and the space for such production is limited in the roll to roll production process. So other methods are also interesting. For example, DAG systems, an electronic business subsidiary of pygmalyon in France, has been developing and manufacturing RFID systems since 1998. Pygmalyon, which has several patents, has developed a unique "unlimited" detection technology using 13.56MHz frequency. The company claims that the detection distance of this technology can reach 10 meters through a wide range of stereo signals, while the UHF technology signal is usually beam shaped, which is easy to produce blind spots. This technology is equipped with an antenna that can detect tags within 60 cubic meters. It was first developed for sports competitions. For example, it was used in the marathon in Rome

currently, DAG tags with a reading distance of several meters are relatively large, but other companies have developed so-called fragment antennas to reduce the tag size in applications with a specific reading distance. Energy capture technology also helps to reduce the size of the label. These labels mentioned above will not cause any problems when encountering the moisture contained in the food

saw RFID breakthrough

saw (surface acoustic wave) RFID has appeared for some time. Hundreds of millions of non RFID saw schemes used in mobile and pagers have the characteristics of high reliability and low cost. Saw RFID technology also benefits a lot from these advantages. Saw RFID first appeared in the uninterrupted highway toll collection systems in California and Norway, but the number is small. And in California they were replaced by silicon chip RFID tags attached to car windscreens. In Norway, microdesign has been supplying read-only passive tags using this technology for more than ten years. Later, in the name of qfree, it began to supply silicon chip RFID read-write equipment and systems for non-stop highway toll collection systems and other equipment that have become a top priority. In fact, until today, no one knows how to make active or readable saw RFID tags, although Dallas' rfsaw has done some good work to show that it can sense tension or temperature changes without additional sensors. The function of inducing tension or temperature can also be realized with silicon chips and separate sensors, but the cost of this method is too high. Today, temperature detection RFID tags are used in livestock and food, but the number is very small

however, although saw RFID still uses fragile chips similar to silicon, its processing process requires fewer steps and requires less accuracy. Therefore, its cost is lower than that of silicon chip RFID. Of course, this has not been really realized in the market. Rfsaw has sold saw RFID devices to many industries, and it is also a major driver in creating a sub standard of ISO 18000 that includes such devices

sterilization process tolerance

the unique physical characteristics of saw ID chip solve the main problems of RFID, and realize:

◆ reliable reading when the distance between tag and reader is large

◆ overcome the situation that the reading signal may be blocked by liquid and metal

◆ commercialized full pallet reading, which is a very important ability for RFID selection and affirmation of 97 pilot demonstration projects

in many applications, the read distance of saw is large enough, so the passive tag can replace the high-cost active tag driven by battery. Saw RFID system has inherent

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