Ultrawideband Magnetoelectric Dipole Liquid Dielectric Resonator Rectenna for RF Energy Harvesting System

In this letter, we propose a magnetoelectric dipole liquid dielectric resonator (ME-LDR) rectenna to improve an RF-DC power conversion efficiency (PCE) in radio frequency energy harvesting systems. The ME-LDR rectenna utilizes a folded ME antenna filled with liquid ethyl acetate dielectric material coupled with a bridge rectifier. Measurements show that the ME-LDR rectenna resonates in the 3.1–6.0 GHz range with a relative bandwidth of 63.7% (
S
₁₁
≤ −10 dB), and a front-to-back ratio of 25.8 dB at 3.8 GHz. This rectenna achieves a PCE of 71.54% at an input power of 18 dBm. The results show that the ME-LDR rectenna improves the PCE and bandwidth through the ME antenna with liquid ethyl acetate. The ME-LDR rectenna can provide a green alternative energy source for portable low-power devices in different sectors, which include wireless sensor networks and healthcare detection.