Dongguan Chengxinxing Smart Card Co.,Ltd
Add: No.25, Jinfu Road, Jinxia Community, Chang'an Town, Dongguan, China
Nicole Lai (Export Manager)
Phone: +8613450794559 (Whatspp)
RFID Tag China's RFID industry after more than more than 10 years of development, now the technology has been more mature, especially in the past two years, in the country actively encourage and vigorously promote the healthy development of the industry in the background, with the various factors on the continuous promotion of IoT, RFID Tag it has maintained a steady rise in the development trend.
RFID frequency standard formulation, the industry also reached a consensus. At present, the common international frequency is 13 high frequency RFID technology because of stable performance, reasonable price, its reading range and the actual application range of distance matching, so in the public transport card, RFID Tag mobile phone payment has been widely used, especially in Korea, Japan and other places.
RFID tag is often accompanied by the use of metal environment, when the RFID tag near the metal, because the metal has a strong reflection of electromagnetic waves, it will be accompanied by a weakening of the signal, reading card distance will become more close, serious interference will appear to read card failure phenomenon. RFID Tag The current general solution is to stick a layer of magnetic absorbing material on the back of the electronic label.
Wave absorbing material in electronic equipment noise reduction, absorbing waves and EMC and other aspects of the use of more, and experts on its interpretation of the principle of work has also done a lot of models, forming a lot of theoretical knowledge, but the disadvantage is that these theories are more complex, some of the readers in the field is difficult to understand.
In combination with many engineers in the use of the problem, RFID Tag this article will be 13.56MHz passive RFID system for the use of absorbing materials for example, with simple, plain and popular language to elaborate, hoping to bring some help to the reader
An RFID system is an electronic tag or contactless smart card (such as a smart phone with a swipe card) that is placed on an object that is identified, a device that sends instructions to an electronic tag, and collects feedback information from an electronic tag, which is also known as an RFID reader or a reader. As shown in Figure 1, RFID Tag in order for other devices to be able to display or use the data, it is generally possible to have an external interface with RS232 protocol on the reader so that information can be communicated with the external device.
Because it is a passive electronic tag, the energy required by the chip and memory work in the electronic tag is provided by the reader, the communication between the reader and the electronic tag is realized by the electromagnetic coupling principle, the energy of the electronic tag is generated by the electromagnetic coupling of the reader coil antenna.
The High-frequency electromagnetic field is generated by the antenna coil of the reader, and then the magnetic field passes through the coil cross-section and the space around the coil. According to the label's use frequency 13.56MHz, its wavelength is 22.1m, far greater than the reader antenna and the electronic tag distance, so can read and write to the antenna distance between the electromagnetic field as a simple alternating magnetic field to deal with.
RFID tag read card distance is not only related to itself, at the same time with the environment has a great relationship. When using an inductively coupled RF identification system, RFID Tag it is often asked that the antenna of the reader or the RFID tag is directly mounted on the metal surface. However, it is impossible to install the antennas directly on the surface of the metal.
Because the antenna's magnetic flux passes through the metal surface, RFID Tag it produces induction vortices, according to Lenz, eddy currents can be applied to the antenna field, and the magnetic field on the metal surface can be rapidly attenuated, so that the reading distance between the reader and the electronic tag will be seriously affected, or even misread or read failure may occur. The results are the same regardless of the magnetic field produced by the coils installed on the metal surface or from the outside to the field of the metal plate (the electronic label on the metal surface).