No abstract

This study presents the design, optimisation, simulation and fabrication of a novel printed elliptical nested fractal (planar) antenna for multiband operation. The proposed antenna is intended to function as the receptor element in radio‐frequency energy harvesting applications. The simple microstrip structure and the compact size of the antenna ease its fabrication and allow it to be integrated with other electronic circuitry. It consists of nested elliptical structures fed by 50 Ω microstrip line with complementary elliptical ground along with rectangular ground plane. The added Hilbert structures at both sides of the antenna feeding line on the top layer enhance its performance to operate in multi‐frequency bands. This antenna exhibits good radiation and reflection characteristics at 910 MHz (global system of mobile (GSM 900)), 2.4 GHz (Bluetooth/wireless local area network), 3.2 GHz (Radiolocation, third generation (3G)), 3.8 GHz (for long‐term evolution, 4G) and additional 5 GHz band (wireless fidelity signals). The overall dimension of antenna is 41 mm (width) × 44 mm (length) × 1.778 mm (thickness). To the best knowledge of the authors, this is the widest bandwidth antenna to be developed at these small dimensions covering major standards from 900 MHz up to 6 GHz for electromagnetic energy harvesting applications.

No abstract

No abstract

The system specifications of RF energy harvesting are outlined, indicating the general guideline of low power circuit and s y stem design as well as the frequenc y set to be used in the s y stem. Four frequenc y bands representing five wireless standards were chosen namel y , GSM, DTV, Wi-Fi, B1uetooth and road tollin g s y stem. A harvesting s y stem has been designed and simulated. A microstrip line antenna, RF-DC rectifier circuit and a volta g e doubler circuit were desi g ned. The simulations show p romisin g p reliminar y results for the RF ener gy harvesting s y stem compared to similar work in Iiteratu reo