# RFID Cards ## What Are RFID Cards? **RFID cards** are contactless smart cards that use radio frequency identification technology for data transmission and identification. These cards contain embedded microchips and antennas that enable wireless communication with RFID readers. From my personal experience working in access control systems, I've found **RFID cards** to be remarkably efficient compared to traditional magnetic stripe cards, particularly in high-traffic environments where speed and convenience matter most. ## How RFID Cards Work ### Technical Specifications and Parameters The technical performance of **RFID cards** depends on several critical factors. At TIANJUN, we provide various RFID solutions with different specifications to meet diverse application needs. **Low Frequency (LF) RFID Cards:** - Frequency: 125 kHz or 134.2 kHz - Reading distance: 0-10 cm - Common chips: EM4100, EM4200, T5577 - Memory capacity: 64-bit to 1k bits - Standards: ISO 11784/11785 (Animal identification), ISO 14223 **High Frequency (HF) RFID Cards:** - Frequency: 13.56 MHz - Reading distance: 0-1 meter - Common chips: NXP Mifare Classic 1K (S50), Mifare Plus, Mifare DESFire EV2 - Memory: 1KB to 8KB - Security: AES encryption available on advanced models - Standards: ISO 14443 A/B, ISO 15693 **Ultra High Frequency (UHF) RFID Cards:** - Frequency: 860-960 MHz - Reading distance: Up to 15 meters - Common chips: Alien Higgs-3, Impinj Monza R6, NXP UCODE 7 - Memory: 96-bit to 512-bit EPC memory plus user memory - Standards: EPCglobal Gen2, ISO 18000-6C **Physical Dimensions:** - Standard ID-1 format: 85.6 × 54 × 0.76 mm (ISO/IEC 7810 standard) - Thickness variations: 0.68mm to 1.2mm depending on material and construction - Alternative formats: Key fobs (typically 30×40×5mm), stickers, wristbands *Note: These technical parameters are reference data. For precise specifications tailored to your specific application, please contact our backend management team.* ## Personal Experience with RFID Implementation In my previous role as a security systems consultant, I discovered a natural aptitude for designing RFID-based access systems. This personal skill developed through hands-on experience with various **RFID cards** and readers. I recall one particular project where we implemented a dual-frequency RFID system for a corporate campus, using HF cards for building access and UHF tags f