研究目的
To design and demonstrate a novel optically reconfigurable planar monopole antenna for cognitive radio applications, enabling multiband frequency switching using silicon-based optical switches.
研究成果
The designed optically reconfigurable planar monopole antenna successfully achieves multiband frequency switching for cognitive radio applications, with good agreement between simulations and measurements. It is compact, uses only two silicon switches, and exhibits omnidirectional radiation patterns suitable for wireless devices. This approach can be extended to design reconfigurable antennas for 5G and future networks.
研究不足
The antenna requires optical excitation for switching, which may involve external laser sources not fully detailed in the paper. The efficiency drops at lower frequencies (e.g., 51.42% at 1.9 GHz) due to small electrical size, and there are slight frequency shifts between simulation and measurement (e.g., 100 MHz shift). Future work could optimize switch integration and reduce size further.
1：Experimental Design and Method Selection:
The antenna design is based on using highly resistive silicon (HR Si) as optical switches to redistribute surface currents for frequency reconfigurability. Full-wave electromagnetic simulations were conducted using CST Microwave Studio to model the antenna and switches.
2：Sample Selection and Data Sources:
Silicon samples with specific resistivities (HR Si: 10 kΩ cm, LR Si: 1-10 Ω cm) were used, characterized from prior work. Antennas were fabricated on RO4003 substrate.
3：List of Experimental Equipment and Materials:
Equipment includes rapid PCB prototyping equipment, anechoic chamber for radiation pattern measurements, and laser sources for optical excitation (not specified in detail). Materials include HR Si and LR Si switches, silver epoxy for bonding, and RO4003 substrate.
4：Experimental Procedures and Operational Workflow:
Four antenna prototypes were fabricated with different combinations of HR and LR Si switches to represent ON/OFF states. Reflection coefficients were measured using network analyzers, and radiation patterns were measured in an anechoic chamber.
5：Data Analysis Methods:
Simulated and measured data (e.g., S11 parameters, radiation patterns) were compared for validation. Surface current distributions were analyzed to understand resonance behaviors.
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