RFID tags have a year, or have the opportunity to become a new corner of the Internet of Things era.
The future of the Internet of Things (IoT) continues to evolve. In the future wireless technologies that help to connect and communicate everything is expected to become even more demanding. For example, the advent of multi-year radio frequency identification (RFID) is an example. However, There are still many different technologies, and most of the technology providers are mostly focused on one of the technologies. Therefore, it may be difficult to determine which solution is good. In this case, in order to know more about the RFID technology, it is necessary to first re-understand RFID is necessary.
According to Control Design's Web site, the RFID technology consists of an RFID tag with an electronic chip that can be linked to the antenna, as well as the ability to send information to an RFID reader that needs to be supplied through a battery or an external power supply electricity.
As for the way of obtaining the power of the RFID microelectronic chip, the power is remotely supplied to the RFID tag end by the RF wave through each time when communicating with the receiving device. The RFID chip can also receive power from the receiving through the RF wave decoding Device, and can respond to the instructions of the receiving device or transmit the information without waiting for the request of the receiving device, which is also a feature of the RFID system.
Some RFID chips have built-in embedded RF transmitters that can form their own RF signals, called "active" RFID technology. The transmitters of such technologies are not only complicated to construct and costly, in this case remote In order to avoid such complexity and at the same time allow the RFID tag to communicate with the receiving device, the RFID tag may have to adjust the characteristics of the impedance or equivalent surface of the radar.
In this case, it will help to modify the signal characteristics such as amplitude or phase of the active RFID tag to the receiving device. This technique, also called Backscattering or Load Modulation, is called "Passive "RFID, so passive RFID is not built-in embedded RF transmitter.
Although RFID technology is not the only automated identification and data capture technology in the world, today's RFID technology such as 1D or 2D barcodes and OCR (Optical Autonomous Meta-Recognition Technology) has long been widely adopted in the market and has the advantage of relatively low price. Even so, RFID technology still has several competitive advantages.
First, there is no need for optical visibility or tag reception in RFID technology, even if the metal and some other materials form a strong interference or require special labeling to overcome this issue;
Second, RFID has the advantage of non-contact reception. Depending on the frequency and label size, passive RFID tags can range from a few millimeters to a few meters in range; active RFID tags receive distances as high as 100 meters or more.
Third, it can receive multiple tag signals simultaneously. For some communication protocols, the receiving device can identify hundreds of different RFID tags within a few seconds. Fourth, RFID technology is based on microelectronic chips and can understand the different transmission and reception technologies of RFID technology and the transmission distance difference.
The most common way to classify various types of RFID technology is to classify frequencies from different RFID systems, such as LF, HF and UHF, but except for these three Taxonomy, the RFID tag and the receiving device can still be carried by the electromagnetic waves carried by the power and communication between the four categories summarized.
First, between RFID tags and receiving devices, electromagnetic or electronic electromagnetic waves carry power and communicate primarily, also known as Near Field Communication (NFC) or far-field operation technology.
The second is to classify whether RFID tags are built-in embedded RF transmitters, that is, active or passive technology.
Thirdly, whether a chip built into an RFID tag is a read-only chip or a built-in non-read-only chip capable of writing new information to the chip once or several times through commands transmitted by the RFID receiving device.
Fourthly, the classification is based on the communication protocol used between the RFID tag and the RFID receiving device.
The technique of waiting for the receiving device to send an instruction to transmit information once it occurs within the signal reception range is referred to as the Interrogator Talk First (ITF) protocol standard; if RFID The speed with which tags transmit information, which is as fast as the powered on of the device being received, is referred to as the "Tag Talk First" (TTF) protocol standard.
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