研究目的
To design a quad-polarization-agile antenna with a recon?gurable feeding network capable of switching between four different polarization states (two orthogonal linear polarizations and two orthogonal circular polarizations) with low insertion loss and compact size.
研究成果
The proposed polarization-agile antenna with a quad-mode recon?gurable feeding network successfully generates two orthogonal circular polarizations and two orthogonal linear polarizations. Experimental results confirm good performance in S-parameters, axial ratios, gains, and radiation patterns, making it suitable for wireless communication systems requiring polarization diversity.
研究不足
The isolation between the two output ports is only around 6 dB, which might affect the antenna's polarization performance. The design requires precise control of PIN diodes and careful fabrication to achieve desired performance.
1：Experimental Design and Method Selection:
The design involves a recon?gurable feeding network with PIN diodes to switch between four transmission modes. The network is integrated with a dual-polarized aperture-coupled antenna.
2：Sample Selection and Data Sources:
The antenna and feeding network are fabricated and measured for performance evaluation.
3：List of Experimental Equipment and Materials:
PIN diodes (SMP1340-079LF), RO4350B substrate, dc bias circuits with inductors and resistors, dc-blocking capacitors.
4：Experimental Procedures and Operational Workflow:
The feeding network is switched among four states by controlling the PIN diodes. The antenna's performance is measured in terms of S-parameters, gain, and radiation patterns.
5：Data Analysis Methods:
The performance is evaluated based on insertion loss, return loss, phase differences between output ports, and radiation patterns.
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