A Tree-Shaped Loaded Printed Antenna for Dual-Polarized Wi-Fi and Sub-6 GHz 5G Energy Harvesting Applications

In this, a dual-polarized two-element circular microstrip patch antenna array in the shape of a tree with microstrip feeding is examined for Wi-Fi and Sub-6 GHz 5G energy harvesting applications. For designing the proposed antenna, a Rogers RO4003 ($\varepsilon_{\mathrm{r}}=3.55$) substrate of 1.524 mm thick and having a loss tangent ($\text{losTan}\delta$) of 0.0027 is chosen. Two asymmetrical L-shaped slots are introduced into the ground plane to yield dual resonance characteristics. The antenna array is observed to be enhanced the antenna gain. A partial grounding approach is investigated to achieve the resonances within 2.45 GHz Wi-Fi and Sub-6 GHz 5G bands with improved impedance matching performance. Further to improve the AR value below the 3 dB level at the upper resonant frequency. The maximum gain achieved within the operating bands respectively is 5.9 dBi and 6.24 dBi. The antenna is sensitive to polarization mismatch within the range of 3.47-3.52 GHz with a minimum AR value of 0.33 dB at a 3.5 GHz frequency. The radiational characteristics of the antenna show that the proposed antenna is suitable for RF energy harvesting applications.