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We propose an invisible multi‐ultra‐thin slot antenna and a planar inverted‐F antenna (PIFA) coupling design for handheld mobile devices in complete metal housing systems. To enhance the bandwidth of the traditional single λ/4 PIFA used in a 2.45‐GHz Wi‐Fi system and to consider the strong impact on radiation due to the metal‐housing shielding effect and position of the internal antenna, this design...