How to choose a uhf rfid card reader? How does it work?
sales1@s4a-access.com
RFID is the English abbreviation of Radio Frequency Identification. In layman's terms, an RFID reader is an automatic identification device that can read electronic tag data. According to the frequency of reading tags, it is divided into low frequency, high frequency and ultra-high frequency card readers. The rfid card uhf needs to be equipped with an RFID antenna to read the tag information.
Introduce
RFID is the English abbreviation of Radio Frequency Identification. In layman's terms, an RFID reader is an automatic identification device that can read electronic tag data. RFID radio frequency identification is a non-contact automatic identification technology. It automatically identifies target objects and obtains relevant data through radio frequency signals. The identification work does not require manual intervention and can work in various harsh environments. RFID technology can identify high-speed moving objects and identify multiple tags at the same time, which is fast and convenient to operate.
"First, it can identify a single very specific object, instead of only identifying one type of object like a barcode; second, 10dbi uhf rfid antenna,it uses radio frequency, which can Data is read through external materials, while barcodes must rely on lasers to read information; third, multiple objects can be read at the same time, while barcodes can only be read one by one. In addition, the amount of stored information is also very large"
Soft ferrite
When the antenna of the non-contact IC card reader/writer is in an environment with a lot of metal substances, installing a plate made of ferrite material on the back of the antenna can reduce the impact of metal substances on the card reading performance and stability. Soft ferrite is easy to cut, but its performance is not as good as that of hard ferrite. The thickness is 1.7mm, the size can be cut arbitrarily, and the frequency range is wide.
Hard ferrite
When the antenna of the non-contact IC card reader/writer is in an environment with a lot of metal substances, installing a plate made of ferrite material on the back of the antenna can reduce the impact of metal substances on the card reading performance and stability. Hard ferrite is cumbersome to manufacture, requires mold opening and machining, but has good performance, is hard, cannot be cut, needs to be customized in size, and has better properties than soft ferrite.
Principle
The basic working principle of rfid tag passive uhf ,RFID technology is not complicated: after the tag enters the magnetic field, it receives the radio frequency signal sent by the reader, and transmits the product information (Passive Tag, passive tag or passive tag) stored in the chip with the energy obtained by the induced current. , or actively send a signal of a certain frequency (Active Tag, active tag or active tag); after the reader reads and decodes the information, it is sent to the central information system for related data processing.
The rapid rise of radio frequency identification technology (RFID) is not only the result of technological development, but also the embodiment of application requirements. Since the 1990s, various applications around RFID have sprung up like mushrooms after a rain. Today, we will briefly introduce RFID technology and its most important product - uhf rfid reader.
Division of frequency bands
In the field of radio frequency, electromagnetic waves are divided into 6 parts by frequency. The main frequency bands of RFID: low frequency, high frequency, ultra-high frequency and microwave.
Low frequency (30~300kHz)
Common operating frequencies are low-frequency 125kHz and 134.2kHz. Low-frequency RFID is mainly used in short-distance, low-cost applications, such as access control, campus cards, gas meters, water meters, etc.
High frequency (3~30MHz)
The high-frequency HF RFID equipment works in the 13.56MHz frequency band. The system transmits energy through the inductive coupling of the antenna coil, and the magnetic field energy decreases rapidly through inductive coupling. The magnetic field signal has distinct read area boundaries. It is mainly used to identify people or items within 1 meter. It mainly follows two protocols: ISO/IEC14443 (A, B) protocol, ISO/IEC15693 protocol.
ultra-high frequency(825MHz--905MHz) for UHF car access control system
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