Application of Mixer Based Vector Modulator in Microwave Interference Cancellation System

At present, a large number of electronic information platforms are equipped with many kind of electronic devices. Different devices work at the same time, causing serious interference with each other, and the interference has the characteristics of complex coupling path and large dynamic range of coupling degree change. Recently, the widely used cancellation technology can hardly meet the needs. The mixer based vector modulator has a wide operating bandwidth and a large dynamic range of amplitude modulation. In this paper, a mixer based vector modulator is applied to the microwave interference cancellation system to eliminate the interference of large dynamic changes in the coupling degree between electronic devices. The feasibility of the microwave interference cancellation technology based on the mixed vector modulator is verified by theoretical analysis and experiment. Designed and implemented a type of microwave interference cancellation system based on a mixer vector modulator with a working bandwidth of 3.5 GHz to 4.5 GHz, which can achieve interference cancellation of 38 dB~66 dB under the condition of wide range of interference coupling 20 dB~60 dB, and the cancellation speed is up to 20dB/50us.