A Simple and Effective Planar Near-Field Measurement Method With Sparse Nonuniform Sampling

This letter presents a sparse nonuniform sampling method for a planar near-field measurement system. First, the Igloo spherical sampling points are mapped into the near-field planar sampling points, which determine the positions and quantity of nonuniform sampling points. Then, the sparse nonuniform sampling points can accurately recover the near-field distribution through linear interpolation. Finally, the fast Fourier transform-based near-to-far-field transformation is applied to derive the far-field radiation pattern of the antenna under the test. Simulations and measurements demonstrate that the near-field and far-field results agree well with those obtained through the existing half-wavelength uniform sampling method. Thus, the presented method can significantly reduce the sampling points without sacrificing the measurement accuracy.