Abstract
A NodeMCU controlled tortoise-shaped bandwidth
reconfigurable antenna for 4G and 5G applications depending upon the
condition of the PIN diode switch is presented in this paper. By
using FR-4 substrate and limited ground plane antenna is designed
with a dimensions of 33 × 22 × 1 mm3. The fabricated
antenna is working for Wi-Fi, INSAT C-band, & direct broadcast
service in the Ku band with a frequency range of 2.13–2.98 GHz,
6.86–8.42 GHz, and 12.03–13.13 GHz, respectively. PIN diode used
to adjust the operational frequency ranges, which will be operated
by the NodeMCU module. When the PIN diode is in the OFF state, the
design antenna resonates at 2.24, 7.81, and 13.70 GHz, and when the
PIN diode is in the ON state, it resonates at 2.45, 7.21, and
12.46 GHz. The designed antenna has a gain of 2.2 to 3.25 dB. In
the ON state, the proposed bandwidth reconfigurable antenna has a
radiation efficiency of more than 92 percent at all operational
frequencies. The measured and simulated (CST Microwave Studio)
findings are very similar. The CDAC Cmote unit examines the proposed
reconfigurable antenna in a practical situation, and sensor data is
successfully sent to the cloud. The data is analyzed using the
machine learning technique.