Several key issues in the design of RFID application systems

On August 15, 2013, the 6th International Internet of Things Development Summit Forum was held concurrently with the “2013 Fifth China (Shenzhen) International Internet of Things Expo”. At the meeting, Professor Wang Dong, Secretary General of Shanghai Electronic Label and Internet of Things Industry and Research Alliance, gave a keynote report on “Several Key Issues in RFID Application System Design”.

Wang Dong, Secretary-General of Shanghai Electronic Labels and Internet of Things Industry and Research Alliance, Wang Dong: I have been here for several years. I just looked at it at noon. Many companies have no business before, but there are a number of new companies, and of course some companies have been in this industry. It turns out that this industry has to develop a blowout, but it has not appeared. I have always wondered if there is a killer application in our industry. The killer application has two characteristics. The first one is a rigid requirement, not a flexible requirement, not a dispensable thing, but something that must be done with RFID. The second quantity is large, and these two features make up the killer. Level of application. I think that the clothing industry is a killer application, but observing that this clothing industry has been promoted abroad until now, the domestic clothing industry RFID is still not up.
Yesterday, I was still talking to an old friend. He said that the clothing industry is doing three things. The first thing is to cope with the huge impact of e-commerce. The second thing is to engage in ERP on the enterprise and take a new level (the second image). Li Ning, Mei Bang, etc., they have billions of inventories, and they have been digesting inventories in the last three years, so it is unlikely that RFID will be used for two or three years.) There are still some companies that I don't name. For example, he knows that the clothing industry is a killer application of RFID. So he asked our RFID company to do a test and then help him to get various government projects. The government has not done anything to defraud the government's money, and the RFID industry has done a very hard job.
There are several driving forces, I think I will run slowly. Today, IoT Media said that there are 250 exhibitions this year, and more than 100 of them have been specially installed, which shows that the industry is slowly getting up. How come up? First, the promotion of the Internet of Things strategy; Second, the smart city, January 29 and August 5, within one year, the Ministry of Housing and Construction has engaged in 190 smart cities, and the wisdom of the city has to be smart, so RFID Maybe you can find a bigger market. Third, the era of big data is coming. Now, Ma Yun has started to engage in big data. It is not necessarily possible to make some real things by investing in physical stores in the past. In the future, it may be represented by RFID through various means. Data collection means collecting a large amount of data, analyzing the business based on the data, then making a series of decisions, or setting up a platform to provide services to customers. The advent of this era of big data may also bring impetus to our industry. Through these three aspects of promotion, maybe the days of RFID will be better.
What is RFID? There are three things, the first application tag; the second reader, and of course the middleware, I am doing middleware. So far, no company has come to me to do middleware, so I put this today. The middleware is omitted; the third is the application solution, with the tag, with the reader, how to solve the enterprise application problem with this tag, the reader, and finally talk about the problem of talent cultivation.
First look at the label application engineering, the main three aspects. The antenna design of the first label, the label has few chips to do. The world can provide high-frequency, ultra-high-frequency chips such as TI. There may be several chips in China that can provide such chips, but this label is too much. What is the difference between them?
I will give you an analysis of why we have encountered many problems in this industry. Some customers want to use them, but because our system integrators and customers don’t know much about RFID basic things, they don’t know much about the future. At that time, he may have tried several kinds of labels, and did not according to the needs of customers, is it a standardized product and label, we need to special design for customer needs, today I will share this with you.
High-frequency tag This is the most basic. The high-frequency tag can be equivalent to such a circuit. The chip can be equivalent to a capacitor. The antenna can be equivalent to a resistor and an inductor. You need to work best with electronic induction to make it match the impedance. How to match? First of all, this chip, we are not in the design of the chip, we buy chips, we buy his chip can see its chip tag parameters. For example, this capacitor, the capacitance of NXP I wrote here is 23.5pf. The second step is based on such a formula. If I know his working frequency and know his capacitance value, I can reverse the inductance value of this antenna. According to this inductance value, I can estimate what kind of antenna should I use for this antenna. For this inductance value, you can see the square antenna here. I have a formula, that is, the inductance and antenna geometry. The shape is related, and then according to such a form, we can conclude that for high frequency tags, the parameter that affects this inductance is the shape of the antenna, including whether it is rectangular or circular, and the width of the coil is The spacing between the coils, if it is a bilateral antenna, also consider the medium and distance between them. I will use a coil with 5 turns, line width and line spacing of 0.8mm, and overall size 40×40mm. Antenna. This is its simulation model, built its simulation model, I can analyze the sweep from 10 trillion to 20 trillion, you can see at what frequency it simulates the shape of this antenna, what is its coil inductance, this The inductance and the inductance you need to select the chip can not match. The size of the second coil can not meet the needs of the customer's application, and the area of ​​the label can be attached, so more simulation combinations can be made. We can change the geometry of this label constantly, and finally we will set it up. This is high frequency. Let me give you an example. This is the actual commercial label of a certain manufacturer. Now it has already been several million. The upper left corner is the actual label, and the lower right corner is the simulation model we built. Through this simulation model, we found that when it is at 13.56 Hz high frequency, its inductance is about 5.36 differential, which is the theoretical value we calculated according to the previous one. Chip and the frequency of evaluation, we can calculate its theoretical value as if it is amplified, this big can just come to a conclusion, because the inductance value is too large, causing its optimal frequency to shift forward, not at 13.56 Hz. It is. Through such a thing, if system integrators and customers understand such a basic knowledge, it is likely that we will improve the actual ability problem in the future.

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