研究目的
Investigating the fundamental efficiency components in an RF power transfer chain for wirelessly powering millimeter-sized sensor nodes in IoT applications.
研究成果
The paper demonstrates the existence of an optimal operating frequency for far-field power delivery to mm-sized sensor nodes, primarily determined by the antenna size and the quality factors of components in the matching network. Millimeter-wave frequencies are shown to be optimal for powering mm-sized sensors for practical matching component Q values. The analysis provides actionable design insights for the future implementation of efficient IoT systems.
研究不足
The study assumes fixed values for the quality factors of matching network components over the entire frequency range and does not account for the effect of the substrate on antenna properties in practical implementations. The analysis also simplifies the modeling of the RF-DC converter by ignoring certain non-idealities.
1：Experimental Design and Method Selection:
The study analyzes the RF power transfer chain, including the power transmitter, free space channel, receiver antenna, matching network, and an RF-DC converter. The operating frequency is considered as a design variable to optimize efficiency at the system level.
2：Sample Selection and Data Sources:
The analysis uses a dipole antenna with a fixed length of 4 mm and a circular loop antenna with a fixed radius of 0.64 mm as representative examples of mm-sized antennas.
3：64 mm as representative examples of mm-sized antennas.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The study considers a transmitter with a fixed equivalent isotropically radiated power (EIRP) of 40 dBm, on-chip antennas, and a Dickson multiplier topology for RF-DC conversion.
4：Experimental Procedures and Operational Workflow:
The methodology involves analyzing the power transfer chain in the frequency range of 1–80 GHz to find the optimal frequency that maximizes the DC output power for given receiver antenna types and sizes.
5：Data Analysis Methods:
The analysis includes calculating the efficiency components of the system, such as range efficiency, receiver antenna gain, matching efficiency, and RF-DC conversion efficiency, and their variation with frequency.
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