Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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A Novel Design of an RF-DC Converter for a Low-Input Power Receiver

  • Au, Ngoc-Duc (Department of Information and Communication, Materials, and Chemistry Convergence Technology, Soongsil University) ;
  • Seo, Chulhun (Department of Information and Communication, Materials, and Chemistry Convergence Technology, Soongsil University)
  • Received : 2017.08.23
  • Accepted : 2017.10.19
  • Published : 2017.10.31
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Abstract

Microwave wireless power transmission (MWPT) is a promising technique for low and medium power applications such as wireless charging for sensor network or for biomedical chips in case with long ranges or in dispersive media such. A key factor of the MWPT technique is its efficiency, which includes the wireless power transmission efficiency and the radio frequency (RF) to direct current (DC) voltage efficiency of RF-DC converter (which transforms RF energy to DC supply voltage). The main problem in designing an RF-DC converter is the nonlinear characteristic of Schottky diodes; this characteristic causes low efficiency, higher harmonics frequency and a change in the input impedance value when the RF input power changes. In this paper, rather than using harmonic termination techniques of class E or class F power amplifiers, which are usually used to improve the efficiency of RF-DC converters, we propose a new method called "optimal input impedance" to enhance the performance of our design. The results of simulations and measurements are presented in this paper along with a discussion of our design concerning its practical applications.

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References

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