即缺陷接地结构，它是近年来提出的一种在微波平面电路接地版上刻蚀出非周期形状的结构。

Defected ground structure (DGS) is a nonperiodic structure proposed in recent years, which means machining various shapes of etching on the ground plane.

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设计了基于虚拟仪器的实验项目，以完成非正弦周期电路章节的实践教学，并介绍了实验项目设计方法、实验内容和实验方。

This paper introduces the realization of experiments in nonsinusoidal periodic circuits which are difficult to be understanded by students and examined by experiments with equipments.

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介绍了非正弦周期电流电路的平均功率测量原理。

The measurement principle of the average power for non sinusoidal period current circuit is introduced in this paper.

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