Abstract
This paper presents a multiband rectenna with a circular polarization Archimedean antenna for radio frequency energy harvesting. The performance of the rectifier by matching to a higher impedance, about 150 O, improved. The antenna's various parameters are studied to adjust its input impedance until the closest input impedance to the rectifier is obtained. The antenna is fed by a coplanar waveguide transmission line (CPW) to eliminate balun, which helps to have a compact and integrated structure. For the proximity of the input impedance, just two inductors are used to match the impedance. By using fewer elements in the matching circuit, structure loss is reduced. A sample of the rectenna is made to confirm the simulation results. The proposed model has a maximum efficiency of about 96% at −8.5 dBm received power and can harvest energy with circular polarization in GSM1800 and 3G bands (1.71, 1.84, 1.94, and 2.14 GHz). The proposed rectenna can be used in low-power devices of non-cellular internet of things (IoT) according to the mentioned characteristics.
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