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A compact integrated dual-port diversity antenna is presented, which is suitable for long-term evolution (LTE) and wireless fidelity (Wi-Fi) applications in handheld devices. The antenna design merges two planar inverted F-shaped antennas (PIFAs) into a single-antenna structure that not only occupies less volume in a handheld device but also eliminates the need to separate two individual antenna elements, which provides further space-saving efficiency. This can be accomplished even while maintaining desirable isolation and diversity characteristics. The proposed design can thus be utilized in compact wireless handheld communication devices that require signal diversity. An example design is described for 2.6-GHz LTE/Wi-Fi bands (2.5-2.7 GHz), which has been implemented in real-world cellular phone environments and include interactions between the antenna, other components of the device, and a model of a human head (the specific anthropomorphic mannequin phantom). The simulated and experimental results, including S-parameters, radiation patterns, signal correlations, and mean effective gain values, have validated the proposed antenna design as useful for compact mobile devices.