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This paper focuses on the introduction of sparsity in a planar spaceborne SAR antenna array operating in Kaband. Given the different requirements in azimuth and elevation, and the large size of the array, sparsity is introduced along the two dimensions separately. While sparsity along the azimuth dimension was considered in an earlier paper, the application of density tapering along the elevation dimension is described here and preliminary results are reported.Index Terms-synthetic aperture radar, phased array antenna, sparse array.I.

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