RFID (Radio Frequency IDentification), or radio frequency identification technology, is an emerging automatic identification technology developed in the 1980s. It is also called electronic tagging and radio frequency identification. The technology is a technology that uses radio frequency signals to achieve non-contact information transmission through spatial coupling (alternating magnetic field or electromagnetic field) and achieves the purpose of identification through the transmitted information.
Radio Frequency Identification Technology
From the principle of information transfer
RFID technology is based on the transformer coupling model (energy transfer and signal transmission between primary and secondary) in the low frequency range, and is based on the spatial coupling model of radar detection target at high frequency range. (The radar emits electromagnetic wave signal and then carries the target information returning radar after hitting the target. Receiver). In 1948, Harry Stockman's "Communication of Reflective Power" laid the theoretical foundation for radio frequency identification technology.
Electronic tags
RFID tags are divided into passive, semi-passive (also called semi-active), active three categories.
passive
Passive tags have no internal power supply. Its internal integrated circuits are driven by the received electromagnetic waves, which are emitted by RFID readers. When the tag receives a sufficiently strong signal, it can send data to the reader. These data include not only the ID number (globally unique identification ID), but also data that pre-exist in the EEPROM within the tag.
Because passive tags are inexpensive and compact, there is no need for a power supply. The RFID tags on the market today are mainly passive.
Semi-active
In general, the passive tag antenna has two tasks. The first is to receive the electromagnetic wave emitted by the reader to drive the tag IC; the second is to switch the signal of the tag to switch the impedance of the antenna to generate 0. With 1 changes. The problem is that if you want the best return efficiency, the antenna impedance must be designed to be “open and shorted,†which in turn will cause the signal to completely reflect and not be received by the tag IC. The semi-active tag is to solve this problem. The semi-active type is similar to the passive type, but it has a small battery. The power can just drive the tag IC and make the IC work. This has the advantage that the antenna can be used as a return signal without the task of receiving electromagnetic waves. Compared with passive, semi-active has a faster reaction speed and better efficiency.
Active
Different from the passive and semi-passive types, the active tag itself has an internal power supply for supplying power required by the internal IC to generate external signals. In general, active tags have a long read distance and a large memory capacity can be used to store some additional messages sent by the reader.
RFID technology includes a complete information technology infrastructure, including:
Radio frequency identification tags, also known as radio frequency tags or electronic tags, are mainly composed of large-scale integrated circuit chips and transceiving antennas that contain identification codes. Currently, they are mostly passive, and the energy used during the use is taken from the radio wave energy received by the antenna. Radio frequency identification (RFID) reading and writing equipment and networking with corresponding information service systems, such as deposit and withdrawal systems.
Comparing radio frequency identification technology with bar code technology, RF class has many advantages, such as:
Can accommodate more capacity. Long distance communication. Hard to copy. High tolerance for environmental changes. Multiple tags can be read at the same time.
Relatively disadvantageous is that the construction cost is higher. However, at present, through the extensive use of this technology, the production cost can be greatly reduced.
Radio Frequency Identification Technology
From the principle of information transfer
RFID technology is based on the transformer coupling model (energy transfer and signal transmission between primary and secondary) in the low frequency range, and is based on the spatial coupling model of radar detection target at high frequency range. (The radar emits electromagnetic wave signal and then carries the target information returning radar after hitting the target. Receiver). In 1948, Harry Stockman's "Communication of Reflective Power" laid the theoretical foundation for radio frequency identification technology.
Electronic tags
RFID tags are divided into passive, semi-passive (also called semi-active), active three categories.
passive
Passive tags have no internal power supply. Its internal integrated circuits are driven by the received electromagnetic waves, which are emitted by RFID readers. When the tag receives a sufficiently strong signal, it can send data to the reader. These data include not only the ID number (globally unique identification ID), but also data that pre-exist in the EEPROM within the tag.
Because passive tags are inexpensive and compact, there is no need for a power supply. The RFID tags on the market today are mainly passive.
Semi-active
In general, the passive tag antenna has two tasks. The first is to receive the electromagnetic wave emitted by the reader to drive the tag IC; the second is to switch the signal of the tag to switch the impedance of the antenna to generate 0. With 1 changes. The problem is that if you want the best return efficiency, the antenna impedance must be designed to be “open and shorted,†which in turn will cause the signal to completely reflect and not be received by the tag IC. The semi-active tag is to solve this problem. The semi-active type is similar to the passive type, but it has a small battery. The power can just drive the tag IC and make the IC work. This has the advantage that the antenna can be used as a return signal without the task of receiving electromagnetic waves. Compared with passive, semi-active has a faster reaction speed and better efficiency.
Active
Different from the passive and semi-passive types, the active tag itself has an internal power supply for supplying power required by the internal IC to generate external signals. In general, active tags have a long read distance and a large memory capacity can be used to store some additional messages sent by the reader.
RFID technology includes a complete information technology infrastructure, including:
Radio frequency identification tags, also known as radio frequency tags or electronic tags, are mainly composed of large-scale integrated circuit chips and transceiving antennas that contain identification codes. Currently, they are mostly passive, and the energy used during the use is taken from the radio wave energy received by the antenna. Radio frequency identification (RFID) reading and writing equipment and networking with corresponding information service systems, such as deposit and withdrawal systems.
Comparing radio frequency identification technology with bar code technology, RF class has many advantages, such as:
Can accommodate more capacity. Long distance communication. Hard to copy. High tolerance for environmental changes. Multiple tags can be read at the same time.
Relatively disadvantageous is that the construction cost is higher. However, at present, through the extensive use of this technology, the production cost can be greatly reduced.
Soft Dice,Soft Toy Dice,Plush Soft Dice,Baby Soft Dice
Ningbo Dikai Imp&Exp Co., Ltd , https://www.longkaitoys.com