RF test process and characteristics
What is an RF test system? What about the RF test process? What are the characteristics of RF testing? Let ’s take a look together.
RF test process
The RF test system is mainly composed of the following three parts:
1. Tag (Radio Frequency Card): It consists of a coupling element and a chip. The tag contains a built-in antenna for communication with the RF antenna;
2. Reader: a device that reads (and can also write in the card) the tag information;
3. Antenna: Passes RF signals between tags and readers. Some systems also connect to an external computer (host computer's main system) through the reader's RS232 or RS485 interface for data exchange.
The reader sends a certain frequency radio frequency signal through the transmitting antenna. When the radio frequency card enters the working area of the transmitting antenna, an induced current is generated, and the radio frequency card obtains energy and is activated; the radio frequency card sends information such as its own coding through the card's built-in transmitting antenna; After receiving the carrier signal sent from the RF card, it is transmitted to the reader via the antenna adjuster, and the reader demodulates and decodes the received signal and then sends it to the background host system for related processing; the host system judges the card based on logical operations Validity, make corresponding processing and control according to different settings, and send instruction signals to control the actions of the actuator.
Characteristics of RF test systems
1. In addition to the influence of metal materials, generally low-frequency can pass through items of any material without reducing its reading distance.
2. Reader / writers working at low frequencies are not subject to any special license restrictions worldwide.
3. Low frequency products have different package forms. A good package is too expensive, but has a service life of more than 10 years.
4. Although the magnetic field region at this frequency decreases rapidly, it can generate a relatively uniform read / write region.
5. Compared with RFID products in other frequency bands, the data transmission rate in this frequency band is relatively slow.
6. The price of the sensor is relatively expensive compared to other frequency bands.
The above is an introduction to the RF test process and features. I hope that everyone will be helpful after understanding the RF test process and features.
