RFID localization using planar antenna arrays with arbitrary geometry

In this paper, we present a method of localizing RFID tags located in a Ricean multipath environment using a planar arbitrary array of reader antennas. By employing the well known MUSIC algorithm, we estimate the range and angular coordinates of the tags. When many reader antennas are positioned closely together, the mutual coupling between them affects the accuracy of localization. Assuming that the reader array is formed of thin half-wave dipoles, we present a technique to compensate the effects of mutual coupling for improving the accuracy of localization.