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5.8 GHz High-Efficiency RF-DC Converter Based on Common-Ground Multiple-Stack Structure.

Jongseok Bae1, Sang-Hwa Yi2, Woojin Choi1

  • 1College of Information and Communication Engineering, Sungkyunkwan University, 2066 Seobur-ro, Jangan-gu, Suwon 16419, Korea.

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Summary
This summary is machine-generated.

This study introduces a novel 5.8 GHz radio frequency-direct current (RF-DC) converter using a common-ground, multiple-stack design. The new design achieves high conversion efficiency and output voltage, ideal for efficient power management.

Keywords:
RF isolation networkmicrowave power transfermultiple-stack RF–DC converterrectenna arrayrectifiervoltage doubler

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Area of Science:

  • Electrical Engineering
  • Radio Frequency Engineering
  • Power Electronics

Background:

  • Efficient conversion of radio frequency (RF) energy to direct current (DC) is crucial for wireless power transfer and energy harvesting.
  • Existing RF-DC converters often face challenges in achieving high efficiency and output voltage simultaneously, especially in multi-stack configurations.
  • Integrating multiple RF-DC converter stacks while maintaining RF and DC ground isolation is a significant design hurdle.

Purpose of the Study:

  • To propose and validate a novel RF isolation network (RFIN) for a common-ground, multiple-stack RF-DC converter.
  • To enhance conversion efficiency and output voltage in RF-DC conversion systems.
  • To demonstrate the feasibility of a compact, single-layer PCB implementation for high-performance RF-DC converters.

Main Methods:

  • Design and implementation of a 5.8 GHz, 4-stack RF-DC converter utilizing a class-F voltage doubler for each stack.
  • Development of a unique RF isolation network (RFIN) enabling combined DC output from multiple stacks without compromising RF ground integrity.
  • Fabrication on a single-layer printed circuit board (PCB) with a common ground plane.
  • Performance evaluation through comparison with a single-stack converter under identical input conditions.

Main Results:

  • The implemented 4-stack RF-DC converter achieved a high conversion efficiency of 73.1%.
  • A high DC output voltage of 34.2 V was obtained with an input power of 21 dBm per stack and a 4 kΩ load resistance.
  • The proposed RFIN effectively combined the DC output of individual stacks while maintaining common-ground integrity.
  • The compact size of the 4-stack converter was 24 mm × 123 mm.

Conclusions:

  • The proposed common-ground, multiple-stack structure with the novel RFIN is effective for high-efficiency, high-output voltage RF-DC conversion.
  • This design offers a viable solution for advanced energy harvesting and wireless power transfer applications.
  • The single-layer PCB implementation demonstrates the practical scalability and integration potential of the proposed architecture.