An Approach for Dolph-chebyshev Uniform Concentric Circular Arrays

Abstract

In this paper, a new design approach for sidelobe reduction in the uniform concentric circular arrays (UCCA) is proposed. This technique is based on tapering the current amplitudes of the rings in the array by the coefficients of an even predesigned Dolph-Chebyshev linear one-dimensional array which has a number of elements that equals twice the number of rings and a prewarped sidelobe level obtained from prewarping curves. These curves map the UCCA desired sidelobe level to a level used in the design of the corresponding one-dimensional array. The UCCA with this tapering scheme is analyzed to have the lowest possible sidelobe level that may reach 53 dB below the mainlobe and the tapering weights are found to be function of the number of elements of the innermost ring and the number of rings in the array.