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An efficient transformation for two dimensional circularly symmetric wideband FIR filters

This paper proposes a novel transformation for the design of two-dimensional (2D) finite impulse response (FIR) wideband filters with perfect circular symmetry. The proposed transformation is based on the kth order McClellan transformation and is found to be successful in generating precise circular contours even for wideband filters. The proposed method outperforms the state of the art transformations in terms of contour approximation accuracy. Design examples illustrate the effectiveness of the proposed transformation.