Validity and Accuracy of Equivalent Circuit Models of Passive Inductive Meshes. Definition of a Novel Model for 2D Grids
| 详细信息 | 推荐本文 | |
- 作者：R. Sauleau ; Ph. Coquet and J.-P. Daniel
- 关键词：periodic surfaces ; inductive 1D and 2D metal grids ; FDTD ; equivalent circuit models
- 刊名：International Journal of Infrared and Millimeter Waves
- 出版时间：2002
- 出版年：2002
- 期刊代码：32_01959271
- 类别：ch
- 卷：23
- 期：3
- 页码：475-498
- 数据来源：sp
摘要
Accuracy of equivalent circuit models of periodic grids is investigated in amplitude and phase in the visible region. The grids studied here are one-dimensional (1D) and two-dimensional (2D) inductive thin metal meshes. They are located in free space and are illuminated by a plane wave under normal incidence. The range of validity and the accuracy of conventional circuit models are defined by comparison with rigorous results obtained with the Finite-Difference Time-Domain (FDTD) method. In particular, it is shown that electrical models of 1D grids are accurate, whereas equivalent circuits of 2D grids should be used very cautiously. Then, a new formulation is proposed to overcome this major drawback. In the non-diffraction region, the agreement between our model and the FDTD results is within 2%for the power reflectivity and 1° for the phase over a very wide range of strip widths.