How to select UHF RFID antenna in jewelry management application?

　　With the development of the Internet of Things, the application of RFID technology in logistics warehousing, retail, asset management, personnel management, intelligent manufacturing and other fields has become very common. With the continuous influx of more and more RFID companies and solution providers, explore UHF RFID technology In the application of their respective industries, how to plan the software and hardware of the system and how to select the hardware has become an important problem for them. Here, Broadwin Smart provides answers to the characteristics of RFID far-field and near-field antennas, and analyzes the application of jewelry management to help you understand the selection of UHF RFID products.

　　First of all, let’s learn about UHF RFID near-field and far-field antennas, how to choose?

　　The understanding of the near field and the far field cannot be simply understood as the literal meaning of near and far. This involves expertise in the transmission and field of radio waves.

　　Radio waves should be called electromagnetic waves or EM waves for short, because radio waves contain electric and magnetic fields. The signal from the transmitter and through the antenna generates an electromagnetic field, which is the converter and interface of the signal to free space. Therefore, the characteristics of the electromagnetic field vary depending on the distance from the antenna. The variable electromagnetic field is often divided into two parts-the near field and the far field. To clearly understand the difference between the two, we must understand the propagation of radio waves.

　　In many projects in actual applications, customers do not know how to choose antennas, especially not knowing which type of antenna to use in the project.

　　Far-field antenna: The identification distance is long, the radiation angle is large, and it is easy to misread the label next to it;

　　Near-field antenna: The identification distance is short, and the radiation is only on the front surface of the antenna. The tag cannot be identified at a long distance, but the tag next to it will not be read.

　　At present, various industries and fields at home and abroad are constantly rising, and more people hope that UHF RFID technology will help their enterprises develop. However, each industry, each field, each company, and even different occasions of the same company have different application requirements for UHF UHF RFID products.

　　For the pain point of "How to ensure that only the tags in the designated area are recognized and the tags next to it are not read?", take the application in jewelry management as an example to tell you the key points of UHF RFID antenna selection:

　　The jewelry management application has the following characteristics:

　　Different types of jewelry are placed in each shelf area;

　　The jewelry display is very close;

　　Need to achieve 100% recognition of the jewelry in the area;

　　The jewelry left area can no longer be read, let alone the label in the showcase next door, etc.;

　　Under such scene characteristics, it is recommended to use UHF RFID near-field antenna.

　　The advantages of near-field antennas are:

　　The electromagnetic field is only distributed on the front surface of the antenna, which is due to the special design of the near-field antenna.

　　The design of the loop of the near-field antenna makes the radiation efficiency of the antenna concentrate on the front surface of the antenna, which makes the recognition effect of multiple tags better, and the radiation angle control is better. The tags are normally recognized on the antenna surface, and they cannot be recognized when they leave. The labels on other items on the left and right sides will not be recognized, thus achieving the true meaning of jewelry management.

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