研究目的
To design a wideband circularly polarized patch antenna with enhanced axial ratio bandwidth using λ/4 and λ/2 resonators.
研究成果
The proposed CP patch antenna achieves a 2% 3-dB AR bandwidth with a low profile of 0.014 λ0 by utilizing λ/4 and λ/2 resonators to create two minima in the AR response. This design provides wideband circular polarization with stable radiation patterns, demonstrating an effective co-design approach for feeding networks in patch antennas.
研究不足
The study is based on simulations only; no experimental validation is provided. The antenna profile is low (0.014 λ0), but the bandwidth (2%) might be limited compared to other wideband designs. The structure may be complex for some applications, and power handling or efficiency issues are not addressed.
1：Experimental Design and Method Selection:
The antenna is designed using a co-design approach of the patch radiator and feeding network, employing one λ/4 resonator and one λ/2 resonator to excite two orthogonal modes. An equivalent circuit model is developed for efficient design, based on cavity model theorem and Chebyshev low-pass filter prototype.
2：Sample Selection and Data Sources:
The antenna is implemented on a Rogers 4003C substrate with a dielectric constant of 3.55 and thickness of 0.813 mm. Dimensions are optimized through simulation.
3：55 and thickness of 813 mm. Dimensions are optimized through simulation.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Rogers 4003C substrate, T-junction power divider, λ/4 and λ/2 resonators, square patch radiator, T stubs for coupling enhancement.
4：Experimental Procedures and Operational Workflow:
The geometry is designed and simulated. Coupling coefficients and external quality factors are calculated. Physical dimensions are determined using an extraction method, followed by fine-tuning. Simulations are performed to analyze reflection coefficient, gain, axial ratio, and radiation patterns.
5：Data Analysis Methods:
Simulation results are analyzed for reflection coefficient (< -10 dB bandwidth), realized gain, axial ratio (3-dB bandwidth), and radiation patterns (cross-polarization levels and stability).
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