Multi-input Multi-output Magnetoelectric Dipole Antennas Comprising Dual Monopole Feed Antennas for Energy Harvesting

A three-dimensional (3-D) inverted-L multi-input multi-output (MIMO) magnetoelectric dipole antenna comprising two coupled monopole feed antennas is developed for energy-harvesting applications. Additionally, the electromagnetic band-gap (EBG) structure was used to improve the isolation (S-21) of the antennas. The bandwidth of the proposed antenna is up to 42.1% for 3-4.6 GHz, which covers the C-band (5G) applications of 3.3-3.8 GHz. The advantages of the proposed antenna are the following: low cross-polarization; good radiation patterns; stable and high gains (9.55 +/- 0.35 dBi) in the operating band; all simulated and measured return loss of the antennas (S-11 and S-22) are below -10 dB; and the isolation between two antennas is below -15 dB. Finally, the proposed antenna is suitable for modern energy-harvesting and 5G wireless sensor network systems.