In radar and communication systems, the use of image rejection mixers can effectively suppress image frequencies and improve the system\'s anti-interference ability. At the same time, it can effectively recover image frequency energy and improve work efficiency. Based on the introduction of the principle of image interference, this paper gives a block diagram of an image rejection mixer. This structure can be used as an image rejection mixer in a receiver and as a single-sideband modulator in a transmitter. This paper analyzes the interference of a certain type of downconverter, compares it with an image rejection mixer, and proposes the feasibility of replacing this type of downconverter with an image rejection mixer.
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