The frequency and characteristics of smart cards
Smart card and reader communication between the electromagnetic wave has a certain frequency. RFID communication patterns of different frequencies have different characteristics.
125K: commonly known as low-frequency card, smart card is a typical representative EM 125K Company and HID's smart card. Such cards are basically read-only, passive cards, identification distance of about 10cm. After a smart card and reader antenna change when, HID's card can be read in 50-60cm, EM card can be read more than 120cm. Note that recognition needs to achieve long-distance and long distance card with the antenna at the same time. For example, the general EMID card reading distance of about 10cm, the same card reader in the long distance of about 40cm can be achieved; use of long-distance EMID card reader in general can achieve only about 10cm reading, only in the long-distance reader can achieve more than 70cm reading.
EM Card EM Card into the card is the cheapest, but also the most widely used card. Before most of the campus cafeteria Shoufan card is used EM card. EM card originated in Switzerland, now the card chips are generally produced in Taiwan, and in-country package.
13.56M: card, called the frequency of such high-frequency card. Normal reading distance of not more than 10cm. The card is the most representative companies in the M1 PHILIPS card. Note, PHILIPS's identification card from M1 up to 10cm, and made compatible identification cards from the M1 is only 50% -70% of imports. TI's Tag_it can read and write electronic tag is also working in this frequency. Tag ¬-it tags with the corresponding antenna, reading distance up to 1 meter or 1.8 meters.
For complex systems or need to offline (not connected to the computer, for example, pay bus) operating system, if M1 card, compared to programming simpler than using ID card number, so now most use M1 card, campus card .
915M: sometimes said to be 900M, the frequency of the card such as ultra-high frequency card. Reading distance is generally 3-15 meters. Generally used for vehicle identification and materials management. When used in vehicles not solid, generally regard the card attached to the windows inside. 915M card is still relatively "fear" of water, and can not penetrate the human body, so the 915M card is not suitable for long-range management personnel.
2.45G: sometimes said to be 2.4G, the type of card is based on the principle of radar non-contact transmission of data to achieve high frequency RFID systems. Also known as micro-Boca. Its characteristics is to identify the range, and the general reading distance is more than 3m, the farthest up to 50m. Active read-write card, need to use batteries.
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