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Evaluating radiation efficiency from characteristic currents

机译：根据特征电流评估辐射效率

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摘要

This study describes an effective technique for calculating modal radiation efficiency calculation based on decomposition into characteristic modes. The key assumption is that the current distribution on the perfect electric conductor is almost the same as in the case of a very good conductor, for example, metals such as copper, aluminium and silver. This assumption is verified against the conventional technique, the impedance boundary condition (IBC). The proposed approach does not require any modification of the formulation of method of moments for perfectly conducting surfaces, which is assumed for the modal decomposition. Modal efficiencies provide an additional insight that is useful especially for the design of small antennas. Taking the feeding into account, the modal losses can be summed up to obtain the total efficiency. The technique works perfectly for common metals, is fully comparable with the IBC, and can easily be incorporated into any present-day in-house solver. A numerical analysis of three antennas is presented to demonstrate the merits of the approach. Radiation efficiency of coupled dipoles, an electrically small meandered dipole, and PIFA were investigated by the presented method. The results are in perfect agreement with the reference commercial package.
机译：这项研究描述了一种有效的技术，用于基于分解为特征模式的模式辐射效率计算。关键的假设是，理想导体上的电流分布与非常好的导体（例如，铜，铝和银等金属）的电流分布几乎相同。该假设已针对常规技术阻抗边界条件（IBC）进行了验证。所提出的方法不需要对用于理想传导表面的弯矩方法的公式进行任何修改，这是模态分解所假定的。模态效率提供了一个额外的见解，这对于小型天线的设计尤其有用。考虑进料，可以将模态损失相加以获得总效率。该技术非常适合普通金属，与IBC完全可比，并且可以轻松地集成到任何当前的内部求解器中。对三个天线进行了数值分析，以证明该方法的优点。通过提出的方法研究了耦合偶极子，电弯曲小偶极子和PIFA的辐射效率。结果与参考商业包装完全吻合。

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