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In this paper, a linear dual-polarized two-element microstrip antenna array is experimentally presented for broadband diversity applications within the IMT-2000 band. Using a ±45° polarization scheme, each patch is fed by two orthogonal microstrip lines, above which an additional square patch is concentrically stacked in order to increase the operating bandwidth. The impedance and radiation characteristics of the optimized configuration are measured. In order to investigate the diversity performance of the array, the far-field coupling, output power correlation as well as the diversity gain are measured at the center frequency in a non-fading channel.