Abstract
A novel octahedron frequency reconfigurable multiband antenna for microwave sensing-based Internet of things (IoT) applications is proposed in this work. This reconfigurable antenna operates over the bands 1.57–2.15 GHz, 2.13–3.0 GHz, 3.17–3.43 GHz, 5.2–5.8 GHz, 6.3–6.78 GHz, 8.31–8.90 GHz, 9.04–9.58 GHz, and 12.03–13.14 GHz, which can be used for wireless sensing, space, and IoT applications. By using omega shape slot in the radiating structure and with PIN diodes switching to change the current direction, the desired resonant frequencies are achieved. The PIN diodes are controlled by using an IoT device NodeMcu. As per the software programmed, the NodeMcu switches the PIN diodes into on and off conditions. We can change the program and monitor through the World Wide Web. The S -parameter characteristics and the radiation patterns have been measured, and good compatibility between simulated and measured results has been identified. The designed model is tested with center for development of advanced computing (CDAC) Cmote device and controlled through IoT for data transmission and reception at desired operating bands.
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