volume | PIER Journals

Abstract

This work proposes a design of rectenna for Wi-Fi energy harvesting application at 2.42 GHz. The proposed antenna includes a modified rectangular patch and two circular radiating elements with partial ground, and adopts a total area of 80 × 80 mm². With the partial ground structure, the proposed antenna shows a better reflection coefficient (S₁₁) at 2.42 GHz. The proposed antenna is a modified conventional patch antenna that shows its improved suitability for Wi-Fi energy harvesting at the targeted band. For rectenna, an impedance matching circuit based on microstrip transmission lines, radial stubs, and enhanced Greinacher voltage doubler rectifier circuits are designed. The rectifier circuit occupies a total area of 25 × 25 mm². The antenna part of the rectenna exhibits quite good S₁₁ < -10 dB and 3.94 dB peak gain. To validate the design experimentally, a prototype of the proposed rectenna is also fabricated. The measured result indicates that at the resonant frequency the rectenna achieves the peak efficiency of 78.53%, and the output voltage is 4.7 V at 0 dBm input power.

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Dr. Rashmi Pandey

Dr. Ashok Kumar Shankhwar

Dr. Ashutosh Singh