研究目的
Investigating the design and performance of a polarization recon?gurable antenna with frequency diversity function using a novel positive and negative perturbation technique.
研究成果
The proposed antenna demonstrates effective polarization reconfigurability and frequency diversity with good impedance bandwidth, 3-dB AR bandwidth, and higher gain at both polarizations. The use of a single diode for switching reduces losses, leading to higher gain compared to conventional designs using multiple diodes.
研究不足
The use of a diode equivalent circuit during simulation leads to a mismatch between measured and simulated performances due to unconsidered parasitic components. The cross-polarization level suppression is not optimal due to the nonlinear effect of the diode.
1：Experimental Design and Method Selection:
The study employs a novel positive and negative perturbation technique to design a polarization recon?gurable antenna. A square slot on the ground plane creates a negative perturbation for circular polarization, and an L-shape segment integrated to the patch using a switching diode creates a positive perturbation for linear polarization.
2：Sample Selection and Data Sources:
The antenna is etched on a 0.8-mm thick Te?on glass ?ber substrate with a relative permittivity of 2.
3：8-mm thick Te?on glass ?ber substrate with a relative permittivity of List of Experimental Equipment and Materials:
15.
3. List of Experimental Equipment and Materials: A PIN diode (MBP1036-B11) is used for switching between polarization states. The design and performances are examined using Keysight Technologies’ EMPro.
4：Experimental Procedures and Operational Workflow:
The antenna's performance is evaluated by applying +1 V and -0.6 V for turning ON and OFF the diode, respectively, to switch between linear and circular polarization.
5：6 V for turning ON and OFF the diode, respectively, to switch between linear and circular polarization.
Data Analysis Methods:
5. Data Analysis Methods: The reflection coefficients, axial ratio, and radiation patterns are measured and simulated to evaluate the antenna's performance.
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