The rapid development of radar technology drives the development of radar reconnaissance technology,so the radar reconnaissance system requires the receiver to be able to quickly and effectively extract the target signal in the signal environment with dense and complex spectrum information.This paper studies a double frequency conversion ultra-wideband heterodyne miniaturized microwave module for radar reconnaissance,with receiving frequency range of 2 to 6.5 GHz,output center frequency of 1800 MHz IF signal,and optional bandwidth of 1000 MHz and 300 MHz.Through the analysis and research on the technical indexes such as spurious suppression caused by frequency combination,in-band flatness in full frequency band,mirror frequency suppression,AGC IF output amplitude of microwave receiving components,this paper puts forward an ultra heterodyne design scheme of high local oscillator secondary frequency conversion,and analyzes and studies the key and difficult points of ultra-wideband design.The test data of the test samples verifies thefeasibility and engineering practicability of the design scheme.
维普
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