A Triple-Port, Triple-Band Wi-Fi Antenna Covering the 2.4/5/6 GHz Bands With a Small Clearance and High Isolation for Metal-Bezel Smartphones

This letter presents a triple-port, triple-band Wi-Fi antenna covering the 2.4/5/6 GHz bands with a small clearance and high isolation for metal-bezel smartphones. The proposed Wi-Fi antenna is composed of three inverted-F antennas, covering the 2.4, 5, and 6 GHz bands, respectively. A filtering-matching circuit and two band-pass filters are applied to achieve high isolation between the different operating bands of the Wi-Fi 2.4, 5, and 6 GHz bands. Furthermore, a capacitor is applied to achieve high isolation among the adjacent bands of the Wi-Fi 5 and 6 GHz bands. A prototype of the proposed antenna can generate desirable -10 dB bandwidths of 2.402-2.486, 5.162-5.942, and 5.846-7.676 GHz. The measured port isolations are all higher than 20 dB. The simulated average efficiencies of the proposed antenna are 72.7%, 65.6%, and 67.9% within the respective bands. The proposed Wi-Fi antenna with three feeding ports and high isolation is a competitive candidate for Wi-Fi antenna applied in modern smartphones.