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Synthetic aperture radiometer applies the interferometric principle to sample in the spatial frequency domain and retrieve the image by Fourier or other numerical transformation. Using this technology, a substantial reduction can be obtained compared to a conventional imaging radiometer. In this paper, the study on least redundant two-dimensional array configuration is presented with numerical simulation examples in two types of configurations. One uses half-circle configuration with least redundant number of elements and taking image by rotating the array. The other configuration selects element positions using simulated annealing around a full-circle to provide a roughly uniform distributed sampling coverage in two-dimensional spatial frequency domain. The results show that the number of elements left round the full circle can also reach the least redundant number, i.e. M=CN2, where N is the number of antenna elements and M is the number of different baseline combinations, represent the maximum number of sampling points in the spatial frequency domain.