High-impedance electromagnetic surfaces with a forbidden frequency band
High-impedance electromagnetic surfaces with a forbidden frequency band
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DOI：
10.1109/22.798001
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发表时间：
1999-11-01
影响因子：
4.3
通讯作者：
Yablonovitch, E
中科院分区：
文献类型：
--
作者：
Sievenpiper, D;Zhang, LJ;Yablonovitch, E
开发了一种新型的金属电磁结构，其特点是具有高表面阻抗。虽然它是由连续金属制成并传导电流，但它不在禁止的频段内传导交流电流。与普通导体不同，这种新的表面不支持传播的表面波，其镜像电流也不是相位反转的，其几何形状类似于波纹金属表面，其中的波纹被折叠成集总电路元件，并分布在二维晶格中，即使周期比自由空间波长小得多，这种表面也可以用固态能带理论的概念来描述。这种独特的材料适用于各种电磁问题，包括新型的低轮廓天线。
A new type of metallic electromagnetic structure has been developed that is characterized by having high surface impedance. Although it is made of continuous metal and conducts de currents, it does not conduct ac currents within a forbidden Frequency band. Unlike normal conductors, this new surface does not support propagating surface waves, and its image currents are not phase reversed, The geometry is analogous to a corrugated metal surface in which the corrugations have been folded up into lumped-circuit elements, and distributed in a two-dimensional lattice, The surface can be described using solid-state band theory concepts, even though the periodicity is much less than the free-space wavelength. This unique material is applicable to a variety of electromagnetic problems, including new kinds of low-profile antennas.