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A radiated disturbance measurement is an important EMC test. However, it is difficult to measure a highly-directive radiated disturbance accurately. Current methods and software can't resolve this problem very well. Therefore a novel and accurate approach is presented in this paper: the scanning area of the radiated disturbance measurement was divided into units and a process called “double-scan” was introduced to ensure the receiving antenna could cover all the units. Theoretical analysis and simulation show that the emission among the whole scanning area of radiated disturbance measurement can be detected effectively and efficiently. Therefore highly-directive radiated disturbances can be measured accurately.