<h1>How RFID Cards Work: A Personal Perspective on Modern Access Control</h1> <p>From my personal experience working in facility security management, the transition from traditional metal keys and basic magnetic stripe cards to <strong>RFID cards</strong> felt revolutionary. I recall the frustration of lost keys and demagnetized badges, a constant operational headache. The introduction of <strong>RFID cards</strong> streamlined our entire access protocol. My personal skill in system integration was truly tested and honed during this migration project, where understanding the underlying technology was crucial for successful deployment and user training.</p> <h2>The Fundamental Technology Behind RFID Cards</h2> <p>In my view, the elegance of <strong>RFID cards</strong> lies in their simplicity and reliability. They operate on Radio-Frequency Identification principles. A typical <strong>RFID card</strong> contains a tiny microchip and an antenna, together forming an inlay. This inlay is passive, meaning it has no internal power source. When brought into the electromagnetic field generated by an RFID reader, the antenna harvests enough energy to power the chip. The chip then modulates the radio waves to transmit its unique identification data back to the reader. This entire contactless process happens in milliseconds.</p> <h3>Technical Specifications and Parameters of a Sample RFID Card</h3> <p>For those interested in the engineering details, here are the technical indicators and detailed parameters for a common high-frequency (HF) RFID card, often used in access control. We frequently utilize similar specifications in TIANJUN's premium access control solutions.</p> <h4>Detailed Product Parameters (Reference Data)</h4> <ul> <li><strong>Chip Model:</strong> NXP MIFARE Classic 1K (MF1S503x)</li> <li><strong>Operating Frequency:</strong> 13.56 MHz (HF)</li> <li><strong>Communication Protocol:</strong> ISO/IEC 14443 Type A</li> <li><strong>Memory Capacity:</strong> 1 KB 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 0 to 10 cm, depending on reader power.</li> <li><strong>Card Dimensions:</strong> Standard ID-1 format: 85.6mm x 54mm x 0.76mm (ISO/IEC 7810).</li> <li><strong>Antenna Material:</strong> Etched aluminum or copper coil embed