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)
China's RFID industry after more than ten years of development, RFID Tag and now technology has been more mature, especially in the past two years, RFID Tag in the country to actively encourage and vigorously promote the healthy development of the industry background, with various factors on the Internet of Things continued to promote its Maintained a steady rise in the development trend.
RFID frequency standards, the industry also reached a consensus. At present, the more common international frequency is 13.56MHz, 13.56MHz high-frequency RFID technology because of stable performance, reasonable price, the range of its reading distance and the actual range of the application to match, RFID Tag and thus in the bus card, mobile payment has been extensive Applications, especially in Korea, RFID Tag Japan and other places.
RFID tags are often used in metal environments. When the RFID tag is close to the metal, the metal has a strong reflectivity to the electromagnetic wave, so the signal is weakened and the reading distance becomes closer. There is a phenomenon of card failure. The current general solution is to paste the back of the electronic label with a layer of magnetic absorbing material.
Absorbing materials in the electronic equipment noise reduction, absorbing and EMC and other aspects of the use of more, and experts explain their working principle has done a lot of models, the formation of a lot of theoretical knowledge, but the drawback is that these theories More complex, RFID Tag some non-readers in this field is difficult to understand.
The RFID system consists of an electronic tag or a contactless smart card (such as a smartphone with a credit card) placed on the identified object and a device for issuing an instruction to the electronic tag and for collecting feedback information from the electronic tag, also known as RFID reader or reader composed of two parts. As shown in Figure 1, in order to allow other devices to display or use these data, RFID Tag the reader can also be installed on the external interface with RS232 protocol, so that you can communicate with the external device.
Because of the passive electronic tags, so the electronic tags and memory required for the work of the energy required by the reader, the reader and the electronic label communication between the electromagnetic coupling principle to achieve, the electronic tag energy By the reader coil antenna through the electromagnetic coupling generated.
The high frequency electromagnetic field is generated by the reader's antenna coil, RFID Tag and then the magnetic field passes through the coil cross-section and the space around the coil. According to the use of the label frequency of 13.56MHz, the wavelength of 22.1m, RFID Tag far greater than the reader antenna and electronic tag distance, so the reader to the antenna distance between the electromagnetic field as a simple alternating magnetic field to deal with.
Through the adjustment of the electronic tag antenna coil and capacitor constitute a resonant circuit, tuned to the reader specified transmission frequency of 13.56MHz, so that in accordance with the loop resonance, the label coil inductor on the voltage generated by the maximum. RFID Tag And the efficiency of the power transfer between the antenna coil and the electronic tag of the reader is proportional to the number of turns of the coil in the tag, the area enclosed by the coil, the relative angle of the two placed, and the distance from each other. RFID tag reader distance has a certain limit because of the reason.
RFID tag reader distance is not only related to their own, but also with its environment has a great relationship. In the use of inductively coupled radio frequency identification system, often made such a request: the reader or electronic tag antenna installed directly on the metal surface.RFID Tag However, it is not possible to mount the magnetic antenna directly on the metal surface.
The traditional absorbing material, the main application of the object is in the military confrontation, to cover up, confuse the other radar reconnaissance of some aircraft, warships and armor tanks, with a very high frequency of the use of microwave, and the use of analysis is far-field model.