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According to the design and debugging of the traditional microwave switch is difficult, and very narrow frequency band is not adjustable, the scope of application is extremely limited, proposes a design method of SPDT microwave switch based on HMC435MS8GE chip, the method adopts HMC435MS8GE chip as the core control switch signal channel, and configure the cavity filter to filter the output signal, the entire product design in a a closed structure, to ensure the integrity of the signal transmission, the design reduces the design difficulty and improve the using range of frequency, greatly reduces the cost of debugging, experiments show that the new microwave switch has the advantages of simple design, convenient use and low conduction loss, turn off good isolation, to overcome the traditional switch shortcomings, meet the actual engineering application, and has good popularization value.