Design a Low-Profile Rectifier Circuit for Wireless Power Transfer Using λ/24 Transmission Line

This paper discusses the design and analysis of a rectifier circuit for wireless power transfer (WPT) that operates at two frequencies: 2.1 GHz and 4.6 GHz. The rectifier’s performance was evaluated using S<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> parameters. At 2.1 GHz, an S<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> value of −21.32 dB indicated that 99.3% of the input power was transmitted to the load, with only 0.7% reflected. At 4.6 GHz, the rectifier performs significantly better, with an S<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> value of −46 dB, yielding a minimal 0.0001% power reflection and 99.9999% power transfer efficiency. The reflected power for 10 mW input was calculated to be about 0.07744 mW at 2.1 GHz and 0.00049 mW at 4.6 GHz. These findings indicate that the proposed rectifier design is highly efficient at both frequencies.