Abstract
This paper proposes a compact rectifier design method for utilizing harmonics. Based on total reflection generated by pure reactance loads at the second harmonic (2nd) and open circuit at the third harmonic (3rd), a compact DC-pass filter is designed to effectively utilize the 2nd and 3rd harmonics excited by the rectifying diode. The amplitudes of the harmonics can be controlled by adjusting the input impedances of the DC-pass filter at harmonics. A prototype operating at 5.8 GHz fundamental frequency is implemented and measured to validate the scenario. When the input power is 18.3 dBm, the measured rectifying efficiency is 71.3%, while the 2nd and the 3rd harmonic amplitudes are −2.4 dBm and 0.1 dBm respectively. This method could also be extended to design a rectifier only utilizing the 2nd or the 3rd harmonic.
Highlights
Microwave power transmission (MPT) transmits power from one point to another [1]or to multiple points [2] through free space
Based on a specially designed DC-pass filter, this paper presents a compact rectifier design method for utilizing harmonics while maintaining high rectifying efficiency
The rectifying efficiency increases as the input power increases
Summary
Microwave power transmission (MPT) transmits power from one point to another [1]. or to multiple points [2] through free space. The separate 2nd harmonic utilization path was employed in [12], but this method had a large size. The rectifier utilized the 2nd harmonic without extra devices and complicated structure, the rectifying efficiency was only 42.5%. Based on a specially designed DC-pass filter, this paper presents a compact rectifier design method for utilizing harmonics while maintaining high rectifying efficiency. The proposed rectifier design method can utilize the 2nd and the 3rd harmonics simultaneously without an extra coupler or a separate harmonic utilization path, and the rectifying efficiency is above 70%. The rectifier design method of only utilizing the 2nd or the 3rd harmonic is alsothe analyzed. Rectifier design method of only utilizing the 2nd or the 3rd harmonic is analyzed
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