The theory of near-field to far-field transformation using spherical-wave expansions is the key to implement the spherical near-field antenna measurement system. It can develop the field in the space which is built by antenna expanding into the sum of spherical wave functions. Because of its complex formula, it will consume a long time to compute. The FFT transformation and the ideas of matrix are put into used in this paper, so the compute speed can be improved and the compute time can be saved. Using this method to testify the near-field data and the far-field data of a horn antenna, the results show that the far-field pattern computed from near-field date and the far-field pattern from theoretical integral equations are compared very well. It is approved that this method can guarantee the calculation precision and shortens the compute time at the same time.
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