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Comparison of application effect of UHF and HF electronic tickets

2020-06-04

RFID ticket system, through the high-frequency ticket test of the current museum and the ultra-high frequency ticket test of the new museum, RFID tickets of the two frequency bands are stable in the process of selling and checking tickets, and can meet the basic requirements of non-contact electronic tickets. 

Check-in speed


The operating frequency of UHF RFID system is 920-925mhz, and the operating frequency of high-frequency system is 13.56MHz. Therefore, the carrier frequency of the UHF system is about 68 times of the carrier frequency of the high-frequency system, and the transmission rate of the UHF system is 68 times of the high-frequency system. In the application of the electronic ticket system, the UHF system has a great advantage over the high-frequency system.

Ticket reading range


The application range of UHF RFID system is generally adjustable from 0 to 10 meters, which varies according to different devices and tags. High frequency RFID system is generally used in a distance of 0-10cm. Compared with high frequency system, UHF system has large reading range and high adjustable precision.

UHF system is designed for different applications of far-field and near-field readout. With the application of far-field antenna, the reading can be up to several meters; with the reading of near-field antenna, it can be fine tuned at 0-1 meter, and the fine-tuning accuracy can reach centimeter level. At the same time, the output power of the reader antenna can be adjusted, and the reading range can be precisely controlled with the far-field and near-field antennas.


For the electronic ticket system, UHF RFID can meet the application of ticket selling and checking:

In ticket selling, the printer of UHF system can control the reading distance to 1cm, so as to effectively control the writing operation of the whole volume of RFID tickets. The app already has super usage on labels from Wal Mart and Metro suppliers.

In the check-in process, the RFID equipment in the check-in channel, together with the near-field antenna of the tag, has realized the range of 0-30cm reading, and the accuracy is adjustable at centimeter-level. The hand-held check-in equipment can reach a reading range of 0-1 m, and the accuracy is adjustable at centimeter-level.

Anti-counterfeiting performance


The internal storage space of the electronic tag chip of UHF RFID system is generally composed of the following parts: TID, user memory, uid.


Among them, TID is tag ID, which is used to distinguish RFID tags during anti-collision. Manufacturers do not open this space to end-users.


User mem0ry is an open space for users to store data.


The uid is the unique ID number of the label. When the chip leaves the factory, the ID number of each label is different. Therefore, the uid is the unique ID number of the label in the world. It cannot be rewritten and can only be read. The uid is unique.


The anti-counterfeiting of UHF RFID system is to store the encrypted MAC value in the chip according to the uid of the tag and the encryption algorithm. In the process of verifying the authenticity, the system reads out the Mac and decrypts it with the key of the system, and obtains the uid of the tag to judge the authenticity against the uid of the read-out tag. The UHF system has a strong anti-counterfeiting performance by using uid and encryption.


Although the high-frequency system is famous for its anti-counterfeiting function, it is widely used in finance, consumption and other industries. In the ticket system, from the perspective of anti-counterfeiting demand, it is not necessary to reach the same level in the financial industry, and the anti-counterfeiting performance of UHF system can fully meet the demand.


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