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This paper describes the detecting way of something to use microwave control sensor module which contains K band transceiver, antenna and Doppler's radar theory. Specially it use K band high frequency which is high resolution and high speed response. It consists of gunn oscillator, schottky diode mixer, patch antenna , IF amplifier, power supply and micom. Major technical specifications are detection area is 13 ft(W) 6.5 ft(D) and tilt angle is -30 to +30 lateral. Doppler sensor are used in industrial control applications, such as counting objects moving on conveyor belt, measuring vibration in machine parts or measuring levels of liquid products, etc. Another major use is for automatic door openers for public buildings.