Negative refraction and focusing in hyperbolic transmission-line periodic grids
Negative refraction and focusing in hyperbolic transmission-line periodic grids
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DOI：
10.1109/tmtt.2004.839944
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发表时间：
2005-01
影响因子：
4.3
通讯作者：
G. Eleftheriades;O. Siddiqui
中科院分区：
文献类型：
--
作者：
G. Eleftheriades;O. Siddiqui
我们提出了一类具有空间双曲色散特性的各向异性周期结构，通过在二维平面网格中布置空载传输线（TL）来合成。这些平面周期性网格支持尖锐光束的形成，称为共振锥。在高度各向异性共振等离子体中观察到类似的共振锥效应。通过连接这些各向异性周期网格的转置版本，可以实现负折射和共振锥体的聚焦。给出了理想 TL 网格的仿真结果，并使用平面微带网格进行了实验验证。这些网格易于以低成本制造。此外，由于 TL 是无负载的并且周期性与波长相当，因此该结构可从微波频率扩展到毫米波频率，并且可用于空间滤波、复用和解复用。
We propose a class of anisotropic periodic structures with spatial hyperbolic dispersion characteristics, synthesized by arranging unloaded transmission lines (TLs) in a two-dimensional planar grid. These planar periodic grids support the formation of sharp beams, called resonance cones. Analogous resonance-cone effects are observed in highly anisotropic resonant plasmas. By interfacing transposed versions of these anisotropic periodic grids, negative refraction and focusing of resonance cones can be achieved. Simulation results are presented for ideal TL grids and are verified experimentally using planar microstrip grids. These grids are easy to fabricate at a low cost. Moreover, since the TLs are unloaded and the periodicity is comparable to the wavelength, the structures are scalable from microwave to millimeter-wave frequencies and could be utilized for spatial filtering, multiplexing, and demultiplexing.