Comments on "Fundamental Efficiency Limits for Small Metallic Antennas".
The purpose of this comment is twofold. First, it shows that bounds presented in the commented paper can alternatively be obtained by directly manipulating spherical vector waves leading to simple formulas which are valid for any electrical size. Second, it highlights specific assumptions made in the commented paper to evaluate losses and tries to replace them via resistive sheet boundary condition.
Publisher URL: http://arxiv.org/abs/1711.00849
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