Very High frequency (SHF) refers to the radio band with frequencies ranging from 3 GHz to 30 GHz. The principle of VHF involves electromagnetic wave propagation, antenna design, signal modulation and demodulation, power amplification and signal processing.
In the very high frequency range, the propagation of electromagnetic waves is affected by factors such as atmosphere, terrain and buildings, and appropriate antenna design and signal processing technology are needed to overcome these interferences.
In addition, the modulation and demodulation of VHF signal also need to consider the frequency bandwidth, modulation mode and signal transmission efficiency.
Power amplifiers play a key role in VHF applications, requiring high efficiency, low noise and stability. In short, the VHF principle is the basis of research and application of VHF technology, involving multiple aspects of knowledge and technology.