1. What is RFID?

RFID (Radio Frequency Identification) is a contactless automatic identification technology that uses radio waves to enable data communication between a reader and an electronic tag. It can accurately identify targets without physical contact and is widely used in identity recognition, anti-counterfeiting and traceability, access control management, and logistics tracking.

The operating frequency bands include Low Frequency (125kHz), High Frequency (13.56MHz), Ultra-High Frequency (860MHz-915MHz), and Microwave.

2. System Composition and Working Principle

Core Components:

Electronic Tag: Stores unique identification information, and can be passive (powered by the reader), active (with built-in battery), or semi-active.

Reader: Generates the RF field, reads/writes tag data, and communicates with the host via an interface.

Antenna: Responsible for transmitting and receiving RF energy, acting as the bridge between the reader and the tag.

Host System: Receives data, processes it, stores it, and integrates business logic.

Working Process: The reader emits RF signals → the tag is activated and returns data → the reader receives, demodulates, and transmits to the host for processing.

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3. Technical Features and Application Areas

Technical Advantages: Contactless identification, can penetrate harsh environments such as snow, fog, and dust.

Supports simultaneous identification of multiple targets, with fast read speed (typically less than 100 milliseconds).

Waterproof, anti-magnetic, high-temperature resistant, data can be encrypted, and storage capacity is large.

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4. Application Scenarios:

Logistics and warehousing, retail management, toll collection (e.g., ETC).

Access control and security, asset management, industrial automation, healthcare.

💡 In a nutshell: RFID is like attaching an 'electronic ID card' to items, using radio waves for fast scanning and identification.