Compact Size Frequency-Agile Antenna Enabling Multi-Mode Functionality for Internet of Things Applications

To meet the multiband operation by Internet of Things (IoT) applications, a compact size antenna is presented in this manuscript. The antenna is capable of reconfiguring its operational frequency by switching the state of diode along with multimode operation among broadband, dual band and tri-band. The compactness is achieved using serpentine shape stubs without compromising the overall performance of antenna in terms of gain and bandwidth. The results show that the proposed work is capable of working for frequencies of 4–7 GHz, 3.5 GHz, 2.6 GHz, 2.45 GHz, 2.1 GHz, and 1.8 GHz that correspond to C-band, 5G-ub-6-GHz, Wi-Max, ISM-band and LTE applications. The analysis of antenna performance involves evaluating its impedance bandwidth, gain, and radiation pattern, and a comparison is carried out with cutting-edge antennas to demonstrate the potential of the proposed research.