A radio frequency (RF) phase shifter is a key component used to adjust the phase of RF signals, widely applied in communication, radar, wireless networks, electronic warfare, satellite navigation, and other fields. By precisely controlling phase variations of the signal, it enables various functions such as beamforming, signal synthesis, and interference suppression. The working principle of RF phase shifters is based on techniques like voltage control, digital control, or current adjustment. Common implementations include semiconductor components, dielectric material variations, or digital signal processor (DSP) control.

RF phase shifters can be categorized into analog and digital types, each suited to different precision requirements and application scenarios. Digital phase shifters typically offer higher precision and programmability, making them ideal for real-time phase adjustments in complex systems. On the other hand, analog phase shifters are more suitable for applications requiring lower cost and complexity.