High frequency rotary joints include coaxial rotary joints, waveguide rotary joints, coaxial waveguide rotary joints. They are also known as high frequency slip rings and radio frequency slip rings. High frequency rotary joints are specially designed for the transmission of high-speed serial digital signals such as high definition signals, radio frequency signals and microwave signals. The series of slip rings support single-channel and multi-channel transmission of high frequency signals. There are also hybrid solutions that support hybrid transmission of high frequency signals with control signals, communication signals, power signals and fluid.