The method of miniaturizedly designing filter based on MEMS chips for x-band receiving module was proposed in this paper, constituting a down-conversion circuit which consisted of a four-way down-conversion receiving channel from X band to L band channel in combination with the filter chips, LO-power divider and power-control circuit. It had functions of amplifying, fil-tering and gain-controling, featured with a small size and low power consumption. By circuit analysis, modeling and simulation, the electri...