UHF radio frequency range refers to the extension of the frequency band from 3GHz to 30GHz. The wavelengths corresponding to frequencies within this limit range from 10 cm to 1 cm.

Medical equipment refers to instruments, equipment, appliances, materials or other items that are used alone or in combination on the human body, and also includes required software. Medical equipment is the most basic element of medical treatment, scientific research, teaching, institutions, and clinical disciplines, including professional medical equipment and household medical equipment.

In the field of machinery industry, disseminate scientific and technological information, publish scientific and technological monographs, display scientific research achievements in mechanical disciplines, exchange production practice and technical experience of innovation and transformation, and disseminate new knowledge of modern science and technology.

In an electrical system, the collective term for the facilities and equipment that connect the generation and consumption of electricity. It belongs to the intermediate link of transmission and distribution of electric energy. It is mainly composed of transmission lines, substations, distribution stations and distribution lines connected to the network. Usually, the unified whole composed of power transmission, substation, power distribution equipment and corresponding auxiliary systems to connect power generation and power consumption is called the power network.

The power system is an electric energy production and consumption system composed of power plants, transmission and transformation lines, power supply and distribution stations, and electricity consumption. Its function is to convert primary energy in nature into electrical energy through power generation devices, and then supply the electrical energy to each user through power transmission, transformation and distribution.