New Single-Feed-Dual-Polarized Antenna for Electromagnetic Radiation Energy Harvesting in ISM Band

This paper introduces an original dual-polarized-cross-cavity patch antenna design for RF energy harvesting. The basis of the design consists of a central cross cavity, where the cavity goes from the top of the dielectric to the ground copper layer. The proposed dual-polarized antenna requires only one excitation port as a standard patch. The targeted bands are the ISM 2.45 GHz and 5 GHz bands. A corner microstrip feed line is used to produce the dual polarization and the cross-cavity increases the dual polarization gain so as slightly reduces the size of the patch. Experimental results agree well with simulation results. The antenna obtains over 3 dB in each co and cross-polarizations at 2.45 GHz. The return loss parameters of the realized prototype that translates impedance matching to 50 Ω goes down to -22 dB at 2.45 GHz and down to -10 dB at 5 GHz. Finally, the proposed structure shows promising performance with up to 48% higher rectified voltage out of a rectifying circuit compared to a standard patch antenna.