Using this model and the relevant dyadic Green's function, some characteristics of a rectangular patch antenna near resonance, such as radiation resistance and space wave efficiency, are analysed.

应用此模型，并结合分层介质中的并矢格林函数，分析了贴片天线的辐射阻抗、空间波辐射效率等特性。

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Mr Llewellyn also questions the theory that building-society conversions will herald a wave of takeovers, leading to efficiency gains as overcapacity is cut.

ECONOMIST: Building societies

We are seeing a wave of new energy companies developing technologies focused on energy efficiency.

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According to Mitsubishi the ADM vessels will also feature a high-efficiency hull and a newly designed bow shape that will reduce wave-making resistances.

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