Abstract
This paper presents a multiband planar antenna with a third-order toroidal coupling structure that has potential applications in mobile communications. The antenna is fed using a coplanar waveguide structure. The radiating body model of the antenna is obtained by scaling and nesting twice in equal proportions based on a first-order toroid. The above patch was printed on a 42 × 55 × 0.1 mm3 polyimide flexible dielectric substrate. This article explores the effect of bending in different directions on the antenna performance and explores the effect of coupling with the human body on the antenna S11. The antenna was simulated using a high-frequency structure simulator and measured in an electromagnetic microwave darkroom. The simulation results of the antenna match well with the measured results, and the maximum gain of its band coverage is 4.39 dBi. The antenna can cover the frequency bands of TD-LTE (B-TrunC) (1.447–1.467 GHz), LTE42/43 (3.4–3.8 GHz), WiMAX (3.3–3.8 GHz), 5G band n78 (3.4–3.8 GHz), WLAN (5.15–5.35 GHz), 5G (5.725–5.825 GHz), and other commercial bands.
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