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In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Fast and Accurate Approach to RF-DC Conversion Efficiency Estimation for Multi-Tone Signals.

Janis Eidaks1, Romans Kusnins1, Ruslans Babajans1

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Summary
This summary is machine-generated.

A new two-frequency harmonic balance (2F-HB) method accurately and efficiently calculates RF-DC power conversion efficiency (PCE) for energy harvesting. This 2F-HB method significantly outperforms existing techniques and validates experimental results for multi-tone signals.

Keywords:
autonomous sensor nodeenergy harvestingfull-wave simulations of PCBharmonic balance methodmulti-tone signalpower conversion efficiencysingle diode rectifiervoltage doublerwireless power transferwireless sensor network

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Circuit Theory

Background:

  • Multi-tone signals offer higher RF-DC power conversion efficiency (PCE) for energy harvesting at lower power levels compared to sine waves.
  • Efficient PCE calculation is crucial for optimizing energy harvesting converter circuits.

Purpose of the Study:

  • To develop a computationally efficient and accurate numerical method for evaluating RF-DC PCE under multi-tone periodic envelope signals.
  • To validate the proposed method experimentally and compare its performance against existing techniques.

Main Methods:

  • Development of a novel two-frequency harmonic balance (2F-HB) method.
  • Comparative analysis of 2F-HB against transient analysis (TA), harmonic balance (HB), and multidimensional harmonic balance (MHB).
  • Experimental validation using a voltage doubler-based RF-DC converter for energy harvesting and wireless power transfer (WPT).

Main Results:

  • The 2F-HB method demonstrates superior computational efficiency and accuracy compared to TA, HB, MHB, and commercial simulators (Keysight ADS).
  • The proposed method shows excellent agreement with experimental measurements, with PCE estimation errors as low as 0.37%.
  • The method is adaptable to various RF-DC converter circuits and frequency bands with minor modifications for integration into simulation software.

Conclusions:

  • The 2F-HB method provides a fast and reliable approach for PCE estimation in RF-DC energy harvesting circuits.
  • The developed method can significantly expedite the optimization process for energy harvesting converters utilizing multi-tone signals.
  • The approach is broadly applicable and validated by experimental results, confirming its practical utility.