研究目的
Investigating the radiation characteristics of the EWE antenna for measuring the reflected wave from lands to predict landslides using bistatic radar technology with AM radio broadcasting.
研究成果
The EWE antenna, when modified with a folded wire, showed improved F/B ratio and S11 characteristics similar to those on a perfect conductor, except for ground with 0% water content. This suggests potential for its use in landslides prediction systems, though further research is needed to overcome the identified limitations.
研究不足
The study found that the F/B ratio deteriorates for ground with 0% water content, indicating a limitation in the antenna's performance under certain conditions. The need for further research to address this issue was highlighted.
1：Experimental Design and Method Selection:
The study focused on the EWE antenna's radiation characteristics when installed on ground with finite conductivity for landslides prediction. Theoretical models and electromagnetic field simulations (ANSYS, HFSS) were employed.
2：Sample Selection and Data Sources:
The study used decomposed granite with varying water contents as samples, referencing geological investigations in Hiroshima.
3：List of Experimental Equipment and Materials:
EWE antenna, electromagnetic field simulator (ANSYS, HFSS), and materials with known complex permittivities.
4：Experimental Procedures and Operational Workflow:
The EWE antenna's size and terminal resistance were varied to study its radiation patterns and F/B ratio. The antenna was also modified with a folded wire to improve performance.
5：Data Analysis Methods:
The F/B ratio and input impedance were analyzed using Smith charts and radiation patterns were compared for different water contents and antenna configurations.
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