source:Industry News release time:2022-07-11 Article author:yu Popular:pcb
High frequency: It is high frequency (VHF or UHF, SHF), and the unit is generally expressed in MHz (megahertz).
Microwave: The frequency of microwave is extremely high and the wavelength is very short. Its propagation characteristics in the air are similar to those of light waves, that is, it travels in a straight line, and it is reflected or blocked when it encounters obstacles. Therefore, the main method of microwave communication is line-of-sight communication. Relays are required after the line-of-sight is exceeded. It is used for microwave communication (Microwave Communication), which is communication using electromagnetic waves with wavelengths between 0.1 mm and 1 m - microwaves. Microwave communication does not require a solid medium, and microwave transmission can be used when there is no obstacle in the straight-line distance between two points. The use of microwave communication has large capacity, good quality and can be transmitted to a long distance, so it is an important communication method in the national communication network, and it is also widely used in various special communication networks. The L, S, C, and X frequency bands are widely used in microwave communication in my country, and the application of the K frequency band is still under development.
Radio frequency: Radio Frequency, referred to as RF. Radio frequency is radio frequency current, which is the abbreviation of high frequency alternating current electromagnetic wave. The alternating current that changes less than 1,000 times per second is called low-frequency current, and the one that changes more than 10,000 times is called high-frequency current, and radio frequency is such a high-frequency current. At present, the most widely used automatic identification technology can be roughly divided into two aspects: optical technology and radio technology. Among them, the commonly used products in optical technology are: barcode and camera. These two types of products have been widely used in people's daily life and are well known to people. For example, barcodes are used for commodity management, and cameras are used to capture illegal vehicles.
High frequency and radio frequency both refer to the frequency of electromagnetic waves. The difference is that high frequency is greater than 10K, and radio frequency is 300K-300G. High frequency electromagnetic waves are called radio frequencies.
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