In order to meet the requirements of wide band in satellite communication system,this paper designs a broadband small step down converter,which has the function to down convert K-band(18～22 GHz)to IF(1.2 GHz).By rational design and optimization of key indexes,the design requirements of 1 kHz step frequency conversion,instantaneous bandwidth over 500 MHz and output spurious less than-60 dBc are realized.The testing results show that the main design indexes are better than the required system indexes.
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