研究目的
To design a multilayered circularly polarized dual-band antenna with a compact rectifier for RF energy harvesting systems, specifically targeting GSM and Wi-Fi bands, to convert ambient electromagnetic waves into electrical energy efficiently.
研究成果
The designed dual-band CP antenna and rectifier achieve efficient RF energy harvesting with gains over 5.2 dBic and 6.14 dBic at respective bands, and RF-DC conversion efficiencies of 43% and 39%. The system is compact and suitable for applications like wireless sensor networks, demonstrating good performance in simulations and measurements.
研究不足
The study is limited to specific frequency bands (GSM and Wi-Fi), and the efficiency might vary with environmental conditions and input power levels. The compact size may impose constraints on bandwidth and power handling. Further optimization could be needed for broader applications.
1：Experimental Design and Method Selection:
The study involved designing a stacked patch antenna with specific perturbations (slits and slots) to achieve circular polarization and dual-band operation. A CRLH-based rectifier was designed for impedance matching and RF-DC conversion. CST Microwave Studio was used for simulation and optimization.
2：Sample Selection and Data Sources:
The antenna and rectifier were prototyped using Rogers RO4003 dielectric substrates. Measurements were conducted to validate simulated performance.
3：List of Experimental Equipment and Materials:
Rogers RO4003 substrates (εr = 3.4, tanδ = 0.0027), copper for metallic layers, SMS7630 diode, lumped components (inductors and capacitors), microstrip lines, and fabrication tools for prototyping.
4：4, tanδ = 0027), copper for metallic layers, SMS7630 diode, lumped components (inductors and capacitors), microstrip lines, and fabrication tools for prototyping.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The antenna was fabricated and measured for return loss, axial ratio, gain, and radiation patterns. The rectifier was simulated and measured for S11 and RF-DC conversion efficiency using harmonic balance simulations and practical testing with varying input powers and load resistances.
5：Data Analysis Methods:
Data were analyzed using simulation software (CST, ADS) and measurement equipment to compare simulated and experimental results, focusing on bandwidth, gain, efficiency, and impedance matching.
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