研究目的
To develop a thin, lightweight microstrip patch antenna that radiates circularly polarized waves with wide beam-width at two RFID bands (920 MHz and 2.45 GHz) for applications such as lifesaving cards in RFID systems, enabling battery-less, wearable, long-distance, and low directional dependent wireless communication.
研究成果
The proposed dual-band CP patch antenna with a cross-shaped slot successfully radiates wide-beam CP waves at 920 MHz and 2.45 GHz, validated through good agreement between simulation and measurement results. The methods allow for tuning polarization directions and beam-widths, making it suitable for RFID applications. Future work could extend this to other ISM and RFID bands, such as 2.45 GHz and 5.8 GHz.
研究不足
The paper does not explicitly state limitations, but potential constraints include the narrow bandwidths (20 MHz at 920 MHz and 80 MHz at 2.45 GHz for impedance, and 5 MHz and 14 MHz for axial ratio), which may limit practical applications in dynamic environments. The antenna's performance might be sensitive to manufacturing tolerances and environmental factors. Optimization for other frequency pairs or polarization directions is suggested for future work.
1：Experimental Design and Method Selection:
The study designed a dual-band circularly polarized microstrip patch antenna with a cross-shaped slot. The design rationale is based on using a slightly oblate round patch antenna to generate CP waves at a main frequency and modifying it with a cross-shaped slot to shift a harmonic frequency to a higher desired band (2.45 GHz). Theoretical models from prior work (e.g., Bolster's method for CP radiation and Iwasaki's miniaturization technique) were employed.
2：45 GHz). Theoretical models from prior work (e.g., Bolster's method for CP radiation and Iwasaki's miniaturization technique) were employed.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: An antenna prototype was fabricated and measured. The design parameters (e.g., patch size, slot dimensions) were selected to achieve resonant frequencies at 920 MHz and 2.45 GHz.
3：45 GHz.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The paper does not specify specific equipment or materials used in the experiments, but it implies the use of simulation tools and measurement setups for S11 and radiation pattern analysis.
4：Experimental Procedures and Operational Workflow:
The antenna was designed with an ellipse patch and a cross-shaped slot. A via-hole was used for feeding. Simulations were conducted to predict performance, followed by measurements of S11 characteristics and radiation patterns (including axial ratio) at the specified frequencies. The process involved optimizing slot lengths and feeding position to control polarization and beam-width.
5：Data Analysis Methods:
Data were analyzed by comparing simulation results (likely using electromagnetic simulation software) with measurement results for S11, radiation patterns, and axial ratio. Bandwidths and beam-widths were calculated from these data.
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