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RFID technology, also known as radio frequency identification, is a communication technology that can identify specific targets and read and write related data through radio signals without the need to establish mechanical or optical contact between the identification system and specific targets.
In the specific application process of RFID readers, the composition of rfid readers will be different according to different application purposes and application environments, but from the perspective of the working principle of rfid readers, they are generally composed of signal transmitters. The signal receiver is composed of several parts of the transmitting and receiving antenna.
Components of RFID reader
The most basic RFID system consists of three parts:
Tag: consists of coupling components and chips, each tag has a unique electronic code, attached to the object to identify the target object;
Reader (Reader): a device that reads (and can also write) tag information, which can be designed as a handheld or fixed type;
Antenna: Transmit radio frequency signals between the tag and the reader.
RFID system workflow
The reader sends a radio frequency signal of a certain frequency through the transmitting antenna. When the radio frequency card enters the working area of the transmitting antenna, an induced current is generated, and the radio frequency card obtains energy and is activated; the radio frequency card sends out its own encoding and other information through the built-in transmitting antenna of the card; the system receiving antenna After receiving the carrier signal sent from the radio frequency card, it is transmitted to the reader via the antenna adjuster. The reader demodulates and decodes the received signal and then sends it to the background main system for related processing; the main system judges the card’s performance based on logic operations Legality, corresponding processing and control are made for different settings, and command signals are issued to control the action of the actuator.
In terms of coupling method (inductance-electromagnetic), communication process (FDX, HDX, SEQ), data transmission method from radio frequency card (load modulation, backscatter, high-order harmonics), and frequency range, different non-contact There is a fundamental difference in transmission methods, but all readers are similar in functional principle and the design and structure determined by this. All readers can be simplified into two basic modules: UHF interface and control unit. The UHF interface includes a transmitter and a receiver, and its functions include: generating UHF transmission power to activate the radio frequency card and provide energy; modulating the transmitted signal to be used for the radio frequency card; receiving and demodulating the signal from the radio frequency card UHF signal.Different UHF interface designs have some differences. The UHF interface principle of inductive coupling system
RFID system application
The main working frequency and effective identification distance of the RFID system are: low frequency 125-134kHz, identification distance <0.5m; high frequency 13.56MHz, identification distance less than 1m: UHF 902-928MHz, identification distance 1-30m microwave is 2.54GHz, The recognition distance can reach 100m. The recognition distance of RFID can range from a few centimeters to more than ten meters, and the application range is very wide. For example, the high frequency 13.56MHz adopted by my country's **.
RFID system helps companies manage IT assets
Fixed asset RFID management system
The management of IT assets by enterprises mostly uses one-dimensional bar codes to mark assets, but bar code marking cannot automatically track the location information of assets, which is inconvenient to find assets, which leads to a long time of use, some of the assets of the enterprise are missing, and a large amount of inventory is required. The manpower check the book information one by one and still can’t make the current asset list. At the same time, as the use time increases, the barcode is easy to fall off and become blurred, which is not conducive to the management of assets; some companies also have confidential assets, which contain For the company’s important data, employees can bring huge safety hazards out of the work area at will.
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