| Summary: | 碩士 === 國立中央大學 === 通訊工程學系在職專班 === 101 === This thesis for car GPS external active antenna used in automotive internal device EMC interference Improvement Study; the active circuit architecture contains the amplifier of the active components and passive components filter combination applied to improve EMC interference situation ,This active antenna overall architecture of a ceramic antenna, located above the FR4 PCB, RF circuit design below FR4 PCB ,commercially available satellite navigation receiver verification signal EMC improve before and after C / N noise than improve the situation, the general automotive electronics subject to a wide range of effects, including harsh environments, high reliability requirements, and the high sensitivity of cost. The automotive internal circuit face many environmental problems, including a power surge, the radio interference (including of the two directions of the car radio transmitting and receiving device), an electrostatic discharge, as well as the electric and magnetic fields of the power line. This thesis in the antenna feed point to design a filter to reduce low-frequency noise interference, and then placed one filter between the first amplifier and the second amplifier ,and finally in the second stage amplifier with GPS IC module placed in a filter to enhance EMC immunity.
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