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Hug 'RFID' and said 'worship than' to use the traditional bar code!

by:JLTcard     2020-11-18
The Internet of things era is growing. In the future, all can help people communicate wireless technology will usher in greater demand. Such as radio, the Internet of things era is growing. In the future, all can help people communicate wireless technology will usher in greater demand. Radio frequency identification system (for example, has existed for many years RFID) There are still many problems, but the field of RFID. These techniques are very different, especially since most technology provider focused on only one of the technology, so it is difficult to determine which solution is good. In this case, in order to better understand the RFID, it is necessary to understand the RFID. RFID components include RFID tag with a built-in electronic chips, the electronic chip can be linked to the antenna, and the information can be transmitted to the RFID receiving device ( The reader) , which need battery or external power supply to provide the required power. For RFID microelectronic chip power access method, the main use of RF wave to RFID tags in each time and receiving equipment communication remote power supply. As the main characteristics of the RFID system, it can be according to the request, instruction or send information of the reception facilities, which can response, and RFID chips can be controlled by RF wave power from the receiving device on instruction decode. Embedded in some of the RFID chip embedded RF transmitter, they can form their own RF signal. It's called 'active' RFID. The technology of emitter is not only more complex and higher costs. In order to avoid the complexity and allow RFID tags and receiving equipment communication at the same time, may not be enough to provide the required power completely, RFID tags have to adjust the equivalent surface impedance and radar. In this case, will help to modify the signal features, such as active RFID tag is transmitted to the receiving device of amplitude or phase. This technology is also known as backscatter or load modulation, is the foundation of the 'passive' RFID. RFID is not embedded in the RF transmitter. Although RFID is not the world's only automatic identification and data capture technology, but nowadays, such as 1 d or 2 d barcode and optical automatic recognition technology ( OCR) Has been widely used in the market, and has a relatively low price advantage. Even so, the RFID technology still has some competitive advantage. First of all, RFID has the advantages of non-contact receiving. According to the frequency and size of label, the receiving range of passive RFID tags can range from a few millimeters to several meters. Active RFID tags receiving distance of up to 100 meters or more, that is not a problem. Second, even if the metal and some other materials to form strong interference, RFID also do not need optical visibility or label receiver function, or special label is needed to overcome this problem. Third, it can receive multiple tags at the same time signal. For some communication protocol, receiving device can be identified in a few seconds in hundreds of different RFID tags. As for how to categorize the various types of RFID, the most common method is to classify different RFID system frequency, such as low frequency ( LF) The high frequency ( HF) And ultra high frequency ( UHF) , but in addition to these three categories, the law can still from the RFID tags and receiving equipment carried by electromagnetic power and communications between the sums up four kinds of classification methods. First of all, between the RFID tags and receiving device, electromagnetic waves or waves is used for carrying power and communicate with each other. It is also called 'the near field of wireless communications' ( NFC) Or the far field operation technology. The second is whether the RFID tag has a built-in embedded RF transmitter are classified, active or passive technology is used for classification. The third is a built-in in the RFID chip is read-only or built-in not read-only chip, they can be sent through the RFID receiver instruction once or several times to write new information into the chip. Fourth, the classification between the RFID tag and RFID receiving equipment use of communication protocols.
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