Compact dual‐band monopole antenna with defected ground plane for Internet of things

Abstract

Internet of things (IoT) is a complex network of physical objects capable of wirelessly communicating with each other. For implementing such an enormous network, the authors design a compact dual‐band antenna with simple structure. By folding the radiating element and resetting the ground plane, the whole size of the designed antenna is only 14 mm × 14 mm same as a thumbnail, which makes the designed antenna easy to fabricate. The fabricated antenna can operate (return loss S11<−10 dB) at two operating bands of 3.4–3.6 GHz for 5G and 5.725–5.825 GHz for 5.8G Wi‐Fi, which means it is able to connect the IoT nodes to the Internet through 5G and Wi‐Fi network. Simulation and measured results demonstrate that (i) folding the L‐shaped stub into U‐shaped can reduce the dimension of antenna, and resetting the ground plane structure to parallel to the feed‐line can achieve better impedance matching between the designed antenna and the sub‐miniature‐A (SMA) connector in both operating bands; (ii) the fabricated antenna is able to fully cover the operating bands of 5G at 3.4–3.6 GHz and Wi‐Fi at 5.725–5.825 GHz, and can achieve nearly omnidirectional radiation patterns over the two operating bands.

Design of a compact triple band antenna with independent frequency tuning for MIMO applications

“…At the three resonant frequencies, the length of the responsible part for each resonance is calculated by Ref. . The guided wavelengths and corresponding resonant frequencies are related by Equation . …”

Compact Tri-Band Patch Antenna for Ku Band Applications

“…Researchers around the world have worked on design, fabrication, and optimization of antennas for FSS and DBS according to ITU norms. In [11], a dual-band antenna with 3.4-3.6 GHz and 5.725-5.825 GHz for 5G and 5.8G Wi-Fi are achieved, respectively. A Spidron-Fractal antenna operating in the Ku band of 11.44-12.48 GHz and 13.47-14.39 GHz is proposed by Nguyen Thi et al in [12].…”

Miniaturized antenna using DGS and meander structure for dual‐band application

“…Mishra et al 14 presented high gain Metamaterial based miniaturized antenna using electric LC resonator. Mao et al 15 suggested a dual-band antenna by folding the radiator along with defected ground structure (DGS) for Wi-Fi applications. In References 16-19, miniaturization of patch and its array elements achieved using DGS.…”