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RFID technology in these few years.The basic principle of RFID technology is not complicated: after the label enters the magnetic field, it receives the radio frequency signal from the reader, sends out the product information stored in the chip by the energy obtained by the induced current, or sends the signal of a certain frequency actively; the reader reads the message and decodes it and sends it to the central information system. The line is related to data processing.
A complete set of RFID systems consists of three parts, the reader and the electronic tag, the so-called transponder and the application software system. The principle is that the reader launches a radio wave energy of a specific frequency to the transponder to drive the internal data out of the transponder circuit, and the reader is connected in order. Read and interpret the data and give the corresponding processing to the application.
According to the communication between RFID card reader and electronic label, it can be roughly divided into two kinds of InducTIve Coupling and backward scattering coincidence (Backscatter Coupling). The general low frequency RFID mostly adopts the first type, and the higher frequency is mostly used in second ways.
The principle of RFID is that when the label enters a magnetic field, if the reader receives a special radio frequency signal from the reader, it can send out the product information stored in the chip (i.e., Passive Tag, passive tag or passive tag), or send a signal of a frequency (i.e., AcTIve Tag, active) by the energy obtained by the inductive current. Tag or active tag, the reader reads the information and decodes it, and sends it to the central information system for data processing.
RFID technology recognizes high-speed moving objects and recognizes multiple tags at the same time. It is easy to operate. It is a simple wireless system with only two basic devices used to control, detect and track objects. The system consists of an interrogator (or reader) and a lot of transponders (or tags). RFID is divided into low frequency, high frequency, ultra high frequency and microwave according to the different frequency of application. The corresponding representative frequencies are below low frequency 135KHZ, high frequency 13.56MHZ, UHF 860~960MHZ, microwave 2.4G, 5.8G; RFID is divided according to energy supply mode. For passive RFID, active RFID and semi active RFID.
The RFID system should include at least the following two parts, one is the reader, the two is the electronic label (or the radio frequency card, the transponder, etc., this article is called the electronic label). In addition, the antenna, the host, etc. should also be included. In the application process of the RFID system, according to the different application purposes and application environment, the composition of the system will be different, but from the principle of the RFID system, the system is usually composed of signal transmitter, signal receiver and transmitting and receiving antenna. The following are explained separately:
In RFID systems, signal transmitters exist in different forms for different purposes, typically in the form of tags (TAG). Labels are equivalent to bar code symbols in barcode technology to store information that needs to be transmitted. In addition, unlike barcodes, labels must be able to automatically send out the stored information under the action of an external force.
In RFID systems, signal receivers are generally called readers. Depending on the type of tags that are supported and the functions that are completed, the complexity of the reader is significantly different. The basic function of the reader is to provide a way of data transmission with labels. In addition, the reader also provides quite complex signal state control, parity error checking and correction functions. In addition to storing information that needs to be transmitted, tags must also contain some additional information, such as error checking information. Identification data and additional information are compiled according to a certain structure and sent out in a specific order. The reader controls the transmission of the data stream by receiving additional information. Once the reader’s information is correctly received and deciphered, the reader determines whether the transmitter needs to resend the transmitted signal through a specific algorithm, or the transmitter stops sending a signal. This is the “command response protocol”. Using this protocol, even in a very short time, very small space to read multiple tags, can effectively prevent the occurrence of “deception problem”.
Programmers are required only for readable and writable tag systems. A programmer is a device that writes data to a label. The programmer writes the data in general to be done offline (OFF-LINE), which is to write the data in advance in the label, and when the application begins to apply, the label is directly attached to the identified item. There are also some RFID applications that write data online (ON-LINE), especially when processed as interactive portable data files in production environments.
Antenna is the transmitting and receiving device for transmitting data between tags and readers. In practical applications, in addition to the system power, the shape and relative position of the antenna also affect the transmission and reception of the data. It is necessary for the professional personnel to design and install the antenna of the system.
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