Proximity (RFID) cards typically communicate at which frequency?

Proximity (RFID) cards typically communicate at which frequency?

• A. 13.56 MHz
• B. 125 kHz
• C. 2.4 GHz
• D. 5 GHz

Answer: (B)

Proximity RFID cards use a low-frequency approach, typically around 125 kHz. This near-field inductive setup powers the passive card from the reader’s magnetic field and allows the card to respond by modulating that field. The low frequency keeps costs down and provides reliable operation at very short read ranges, which is ideal for access control where you want a simple, inexpensive card that works close to the reader and isn’t overly sensitive to metal surroundings. Higher-frequency bands like 13.56 MHz are used for smart cards and NFC with different capabilities, while 2.4 GHz and 5 GHz are dominated by Wi‑Fi/Bluetooth and other wireless tech, not the classic proximity cards.

Proximity RFID cards use a low-frequency approach, typically around 125 kHz. This near-field inductive setup powers the passive card from the reader’s magnetic field and allows the card to respond by modulating that field. The low frequency keeps costs down and provides reliable operation at very short read ranges, which is ideal for access control where you want a simple, inexpensive card that works close to the reader and isn’t overly sensitive to metal surroundings. Higher-frequency bands like 13.56 MHz are used for smart cards and NFC with different capabilities, while 2.4 GHz and 5 GHz are dominated by Wi‑Fi/Bluetooth and other wireless tech, not the classic proximity cards.