▎ 摘　　要

NOVELTY - The mixer has two first direct current (DC) biasers whose radio frequency ends are respectively connected to the through end and the coupling end through a micro-strip line. Two DC bias terminals are connected to a DC power supply. The two radio frequency (RF) DC terminals are connected to the front end of the multilayer graphene through a micro-strip line, respectively. The DC power supply is provided to generate a DC signal that excites multi-layer graphene. The DC signal is recovered by the second DC biaser after multi-layer graphene. The coupling signal is sent to a low-pass filter after the intermediate-frequency signal and the high-frequency signal are generated at the back end of the multi-layer graphene. The low-pass filter outputs the intermediate-frequency signal after filtering the high-frequency signal. USE - Graphene down-conversion mixer based on direct current bias. ADVANTAGE - The mixing performance can be improved after the direct current signal excites the multilayer graphene, so that the coupled signal excites the multilayer graphene to better generate intermediate frequency signals and high frequency signals. The low-pass filter is used to filter out high-frequency signals to obtain an intermediate-frequency signal. The down-conversion mixer has a low standing wave ratio, wide input power linearity, and reduced conversion loss, so as to improve the sensitivity of the system. DETAILED DESCRIPTION - The coupling signals output from the through terminal and the coupling terminal respectively enter the corresponding mixing unit, and are sent to the multilayer graphene together with the DC signal to excite the graphene. An INDEPENDENT CLAIM is included for a design method of graphene down-conversion mixer. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the graphene down-conversion mixer. (Drawing includes non-English language text)