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A novel differential dual-frequency antenna using proximity coupling is proposed. Dual bands are realized by a slot in the ground plane. The lower resonant frequency is controlled by the slot in the ground plane, and the upper resonant frequency is mainly determined by the dimensions of the radiating patch. Measured results show that the proposed antenna can operate at 2.51 GHz and 5.38 GHz. In recent years, increasing competition in the wireless communication market has generated the need for fully integrated Radio Frequency (RF) front-end solutions, for which differential signals are preferable. Because most conventional antennas are single-port devices, a balun is usually used to connect the single-feed antenna and integrated circuits.
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