【 Weak current College 】 RFID system mainly hardware device 】

The most basic RFID system consists of three parts:
· Label (Tag): by coupling components and chips, each label has a unique electronic coding, attached to the object identifies the target object;
· Reader (Reader): read (and sometimes also can write) label information device, designed to be portable or stationary;
· Antenna (Antenna): in the tag and reader between RF signal.
Electronic label General save agreed format for electronic data, in practice, the electronic label attached to the question to identify objects on the surface. Readers can read without contact and identification tag in the preservation of electronic data, so as to achieve the purpose of automatic recognition. Usually the reader and the computer is connected, read by label information is passed to the computer to the next step. Transponder (answering machine)/Tag (labels, card)
For passive RFID system, we will not take the initiative to read-write device transmits RF signal of RFID unit called the Tag, and will be active in the reader RF signal transfer of RFID unit called a Transponder, now the industry is no longer strictly distinguish between these two types of name and Tag and mutual common Transponder. For the convenience of this introduction, we will actively transmitting RF signal of RFID unit known as "active" Tag, but only for RF signal reflection or reverse scatter of RFID unit known as "passive" Tag.
Tag contains can be used for authentication to identify the objectives of the attachment of the related information data. Tag can be read-only, read/write both or write/read more in the form of; can be "active" or "passive". Typically, the "active" Tag requires a dedicated battery support its transmitter and receiver, tomorrow it is active, but not necessarily big RAM area. To avoid interference, active tag required to receive and forward multiple frequency of the signal to avoid adjacent channel interference, the composition of the card and power consumption isalso complex. From here, the "active" Tag is generally lower than that of "passive" Tag in the body to larger and more expensive. In addition, the "active" Tag of life are directly related to its battery life.
"Passive" Tag on the basis of its application, can also be divided into the "power" and "power" mode. "Passive" Tag from reader or transfer receiver (Transceiver) from the RF signal reverse factors and information related to your decoder will join its reflection of RF signals. For "passive" Tag, it does not need batteries to magnify reverse signal carrier energy, use "passive" Tag is used to support the battery only Tag memory work or support Tag in reflective signal modulation decoding components work. The antenna should be at least any RFID system consists of a root antenna (either a built-in or external) to transmit and receive RF signals. Some of the RFID system consists of a root antenna for both complete transmit and receive; and some RFID system consists of a root to do transmit antenna and one receive antenna to take root, the antenna should be in such form and quantities depending on the application. RF Transceiver (transceivers) RF Transceiver is the source of the RF energy. It produces RF signal and RF energy activation and support (to give) "passive" RFID Tag. RF transceiver can be integrated package to the reader, you can also exist as a separate device. When used as a stand-alone device, generally classified as RF module. RF Transceiver is mandated by the antenna transmitting and receiving of electronic frequency control and modulation decoding; on the "passive" RFID Tag on reflection or backscatter to RF signals are filtered and zoom. Reader RFID reader's task is to control the RF Transceiver transmitter RF Transceiver RF signal through from the Tag on the encoded RF signal, the Tag's certification recognition information is decoded; identifying information for the certification and several other related information on the Tag is transferredto the host for processing. Some readers also has other features, such as in the ETC (electronic toll collection) application that includes the acquisition vehicle detector, and drive the barrier gate, traffic lights and other equipment of digital input and output information. The reader some hardware in the control of the reader. The user can control host or local terminal publish command to change or customize the working model adapted to the specific application needs.