电导率降低对线天线性能的影响
The impact of reduced conductivity on the performance of wire antennas
摘要：
天线生产的低成本方法主要旨在降低金属化的成本。这可能导致电导率降低。对电导率的影响进行了系统研究。对于电导率在$\mathrm{10^3}$至$\mathrm{10^9}$ S/m范围内的材料，比较了圆柱形导线弯折线、偶极子和八木宇田天线的效率、增益和带宽。在此范围内，偶极子和曲折线的吸收效率变化不大，而电导率对天线的辐射效率和吸收截面有显著影响。偶极天线和曲折线天线（戴维南等效电路适用的天线）的消光截面也随辐射效率而变化。从辐射效率的角度来看，偶极子天线的性能是最强大的电导率下降。在这项研究中研究的黄铜和石墨制成的。采用改进的惠勒帽法（IWC）测量了天线的辐射效率。测量结果表明，与模拟合理的协议。我们还测量了六个制造的原型的消光截面。
英文摘要：
Low cost methods of antenna production primarily aim to reduce the cost of metalization. This might lead to a reduction in conductivity. A systematic study on the impact of conductivity is presented. The efficiency, gain and bandwidth of cylindrical wire meander line, dipole, and Yagi-Uda antennas were compared for materials with conductivities in the range $\mathrm{10^3}$ to $\mathrm{10^9}$ S/m. In this range, the absorption efficiency of both the dipole and meander line changed little, however the conductivity significantly impacts on radiation efficiency and the absorption cross section of the antennas. The extinction cross section of the dipole and meander line antennas (antennas that Thevenin equivalent circuit is applicable) also vary with radiation efficiency. From the point of radiation efficiency, the dipole antenna performance is most robust under decreasing conductivity. Antennas studied in this study were fabricated with brass and graphite. Radiation efficiency of the antennas were measured by improved Wheeler cap (IWC) method. Measurement results showed a reasonable agreement with simulations. We also measured the extinction cross section of the six fabricated prototypes.
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