<h1>What Is RFID Card?</h1> <p>An RFID card is a type of smart card that uses radio frequency identification technology to wirelessly transmit data for identification, authentication, and data transfer. From my personal experience working in access control, the shift from traditional magnetic stripe cards to RFID cards was revolutionary, drastically improving speed and reliability. I've always had a knack for understanding wireless technologies, which made deploying and troubleshooting these systems a skill I developed quickly.</p> <h2>Core Technology and Working Principle</h2> <p>In my view, the elegance of RFID lies in its simplicity. A typical system consists of the card (tag) and a reader. The reader emits a radio signal, which powers the passive tag's microchip via electromagnetic induction. The chip then modulates the signal and sends back its unique identification data. This seamless interaction is what makes it so powerful.</p> <h3>Technical Specifications and Parameters of a Common RFID Card</h3> <p>For a practical application, let's consider a typical high-frequency (HF) RFID card used in access control and payment systems. Here are the detailed technical parameters. *Please note: These technical parameters are for reference data; specifics need to contact backend management.*</p> <h4>Detailed Product Specifications</h4> <ul> <li><strong>Chip Model:</strong> NXP MIFARE Classic 1K (MF1S503x)</li> <li><strong>Operating Frequency:</strong> 13.56 MHz</li> <li><strong>Communication Protocol:</strong> ISO/IEC 14443 Type A</li> <li><strong>Memory Capacity:</strong> 1KB EEPROM, organized into 16 sectors with 4 blocks each.</li> <li><strong>Data Retention:</strong> Up to 10 years.</li> <li><strong>Read/Write Distance:</strong> Typically up to 10 cm (depending on reader power).</li> <li><strong>Physical Dimensions:</strong> Standard ID-1 format: 85.6mm x 54mm x 0.76mm (conforms to ISO/IEC 7810).</li> <li><strong>Supported Features:</strong> Mutual three-pass authentication, anti-collision mechanism.</li> </ul> <h3>Entertainment and Charitable Application Cases</h3> <p>The use of <strong>RFID card</strong> technology isn't limited to security. A fantastic entertainment case is in modern theme parks. Visitors wear <strong>RFID card</strong> wristbands that act as t