A polarisation diversity antenna for an ultra-high-frequency RFID tag is presented. The antenna consists of two dual-planar inverted-F antennas arranged in a cross-configuration, and mountable on a metallic object. The antenna can work together with a linearly polarised reader antenna that has an arbitrary polarisation direction. The proposed tag antenna has a nearly uniform read range between 9.1 and 10.2 m, regardless of the polarisation direction of the reader's transmit field.

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