Abstract
In this letter, we proposed a simple design method of rectenna for dual-band wireless power transmission (WPT). This method introduces a codesign of a Schottky's diode and antenna's impedance at 2.45 and 5.8 GHz, which are conjugate matching, respectively. One example shows the design. The rectifying diode presents capacitive impedance, and inductive impedance can be given by a loop antenna through optimization. A Schottky diode is directly connected into the dual-band antenna. An uncomplicated structure is achieved without additional matching network and filtering. For validation, a rectenna working at 2.45 and 5.8 GHz was designed, fabricated, and tested. The measurement results show that a maximum conversion efficiency of 70% with a load resistance of 400 Ω was realized at 2.45 GHz. At 5.8 GHz, the peak efficiency is 61.5% with a load resistance of 200 Ω. This rectenna can be used to charge electronic devices, such as wireless sensors.
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