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It is known to us, double-ridged horn antenna is one of common and important antenna types, it has been widely used in the EMC, measurement, radar and communication system. A 118GHz double-ridged horn antenna that possesses high performance is designed with the HFSS. VSWR, Gain and radiation pattern of the antenna can fulfill engineering demands based on the simulation of HFSS. Further, this paper shows a new comparatively method of post-cavity treatment in antenna.