# RFID Card Technology and Applications ## What is an RFID Card? An **RFID card** is a contactless smart card that uses radio frequency identification technology to transmit data wirelessly between the card and a reader. These cards contain a small integrated circuit (chip) and an antenna embedded within the card's plastic body. From my personal experience working in access control, the shift from magnetic stripe cards to **RFID cards** was revolutionary, offering much faster and more reliable authentication for employees entering our facilities. ## How RFID Cards Work: A Personal Perspective Having implemented several RFID systems, I've always been fascinated by the seamless interaction. When you bring an **RFID card** within range of a compatible reader (typically a few centimeters to several meters, depending on frequency), the reader's electromagnetic field powers the card's chip. The chip then transmits its stored unique identifier back to the reader. My natural aptitude for understanding wireless protocols helped me quickly grasp the nuances of different RFID frequencies and their applications. ### Technical Specifications of Common RFID Cards Here are detailed technical parameters for some standard **RFID card** types. *Please note: These technical parameters are for reference only. For exact specifications, please contact backend administration.* **Low Frequency (LF) RFID Card - 125 kHz** * **Chip Examples:** EM4100, EM4102, T5577 * **Frequency:** 125 kHz * **Read Range:** 0 - 10 cm * **Memory:** Read-only (typically 64-bit) or Read/Write (T5577: 330-bit) * **Standard Dimensions (ISO/IEC 7810 ID-1):** 85.60 mm × 53.98 mm × 0.76 mm * **Common Standards:** ISO 11784/11785 (Animal ID), ISO 14223 **High Frequency (HF) RFID Card - 13.56 MHz** * **Chip Examples:** NXP MIFARE Classic 1K (MF1S503x), MIFARE DESFire EV2, NTAG213 * **Frequency:** 13.56 MHz * **Read Range:** 0 - 10 cm * **Memory:** Varies by chip (e.g., MIFARE Classic 1K: 1KB EEPROM, 16 sectors) * **Communication Protocol:** ISO/IEC 14443 A/B * **Standard Dimensions:** 85.60 mm × 53.98 mm × 0.76 mm **Ultra-High Frequency (UHF) RFID Card** * **Chip Examples:** Impinj Monza R6, NXP UCODE 7 * **Frequency:** 860 - 960 MHz (region dependent) * **Read Range:** Up to 12 meters * **Mem