Abstract
This paper presents the low profile, planar, and small-size antenna design for WWAN, LTE, and 5G (5th generation wireless systems) for use in portable communication equipment. The antenna occupies only 65 × 13 × 0.4 mm3, and the antenna is combined with a 200 × 260 mm2 copper plate to simulated system ground plane. In the low band, a direct-fed right-side arm and a coupled-fed arm implemented can excite a 1/4 λ fundamental resonant mode at 0.85 and 0.76 GHz to cover 0.698–0.96 GHz and upper 3/4 λ and 5/4 λ resonant modes are controlled by L-shaped element at 2.34, 2.69, 3.4, and 4.0 GHz to cover 1.71–2.69 GHz and 3.2–4.2 GHz. The direct-fed left-side arm produced 1/4 λ to cover 5.15–5.85 GHz. In far-field measured, peak gain and efficiency in low, middle, and high bands are 0.43–5.67 dBi and 55–86%. Finally, experiments demonstrate that the present antenna exhibits a good performance for portable devices.
Highlights
A bent arm was used by other researchers to design an antenna for multiband applications [12, 14]. e present study was executed to design an antenna exhibiting low as well as high operating bands achieved by applying direct-fed and coupled-fed mechanisms; the derived bands can encompass the LTE, WWAN, C band (n77 and n78), and license-assisted access (LAA) application bands
The antenna can suitably be placed on the top side of the compartment of an NB or tablet. e aforementioned direct-fed arm implemented can excite a 1/4 λ fundamental resonant mode at 0.85 GHz as well as upper 3/4 λ and 5.4 λ resonant modes at 2.69 and 4.0 GHz, respectively, (a)
For antenna testing in this study, one side of a coaxial cable was connected to the direct-fed arm and the other side was connected to the contact system ground plane, which was used to provide the RF signal input
Summary
Value (mm) 65 23 8 14.5 21.75 14.25 15 13 ground plane were simulated by a 13 in screen measuring 200 × 260 mm. Is direct-fed arm had a resonant fundamental mode at 0.85 GHz. Figure 5(a) displays the simulated S11 values derived when different lengths were considered for the right-side direct-fed arm implemented on the right side.
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