A Dual-Band Dual-Antenna System with Common-Metal Rim for Smartphone Applications

Abstract

A dual-antenna system operating at WIFI and GPS bands is proposed for common-metal rimmed smartphones applications. This dual-antenna system, which is horizontally placed on a ground plane of 4.5 × 75 mm2, consists of two folded inverted-F antennas (IFAs) sharing the same metal rim. Each IFA contains part of the metal radiating arm, and both IFAs own approximately one-quarter free space wavelengths at 2.44 GHz. A matching network is embedded in the feeding line of the left IFA to provide a resonant frequency at 1.575 GHz. By adjusting the positions of the shorting branch and feeding line, good impedance matching is obtained. Two gaps in the metal frame and a center shorting branch between two IFAs are adopted to improve the isolation. The isolations of better than 22 dB and 19 dB in GPS and WIFI bands are attained, respectively. The proposed antenna is fabricated, and the measured results regarding S-parameters, radiation efficiency, gain, as well as diversity performances are presented.

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“…e radiation efficiency results presented in the literature have shown the decrement of 18.37 and 20% [21,22] as compared to the proposed antenna results.…”

“…e proposed antenna dimensions are very compact and decreased by 74.2, 82.24, 93.8, and 86.6% as compared to recently reported work [21][22][23]31]. Figure 3(a) shows the developed prototype simulation result of peak realized gain.…”

“…Additionally, two resonances centered at 9.9 GHz and 10.8 GHz are observed across the operational frequency band. Also, the proposed antenna impedance bandwidth is increased by 37.8% as compared to [21].…”

“…A comparative analysis of the antenna key features with state-of-the-artwork is demarcated in Table 2. e high-gain and radiation efficient antennas were investigated in [21,22] which occupied an ample space. In [23,31], the proposed antenna achieved only high gain with ample space.…”

“…Another study on the bowtie antenna applied the complex structure of the artificial magnetic conductor ground plane and obtained the peak gain near 8 dBi [20]. Xu et al proposed two antenna models [21]. ey achieved the peak realized gain 5.1-5.5 dBi and the radiation efficiency 71.5-77.2%.…”