A Patch Rectenna With an Integrated Impedance Matching Network and a Harmonic Recycling Filter

A new compact patch rectenna is presented in this letter. It consists of a rectangular patch antenna, a Schottky diode, and a harmonic filter with impedance matching to improve the rectifying efficiency. The filter is realized by a series short-ended one-eighth-wavelength microstrip transmission line, which also balances the capacitive impedance of the diode. The impedances of the diode and patch antenna are matched well by tuning the patch antenna and short-ended transmission line. A meander line is used to build a dc output path. For validation, a rectenna working at 2.45 GHz is designed, manufactured, and measured. A maximum rectifying efficiency of 82.2% is realized when the dc load is 400 Ω at an input power of 22.5 dBm. The proposed patch rectenna has potential applications such as rectenna arrays in wireless power transmission.