High-power microwave filters and frequency selective surfaces exploiting electromagnetic wave tunneling through ϵ-negative layers
High-power microwave filters and frequency selective surfaces exploiting electromagnetic wave tunneling through ϵ-negative layers
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DOI：
10.1063/1.4790584
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发表时间：
2013-02
影响因子：
3.2
通讯作者：
Chien‐Hao Liu;N. Behdad
中科院分区：
文献类型：
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作者：
Chien‐Hao Liu;N. Behdad
实验研究了电磁波在由双正层包围的负折射（ENG）超材料层中的隧穿现象。初步实验进行了使用矩形波导，其工作在其截止频率以下，以模仿ENG层。该ENG层，然后夹在两个介电常数相对较高的介电基板，它示出了整个设置作为一个经典的微波滤波器与二阶带通响应。利用频率为9.382 GHz、脉宽为1 μs、峰值功率为25 kW的大功率磁控管源对该滤波器的功率处理能力进行了实验研究。根据实验结果，提出了两种提高多层结构功率处理能力的方法。特别是，它表明，模仿ENG层与薄穿孔金属片与亚波长孔显着提高其峰值功率处理能力。这样的设备的原型设计，制造和实验特征，它被证明，它可以处理极高的高峰功率电平。在这项工作中提出的结果预计是有用的微波滤波器和频率选择表面，可以处理极高的高峰功率电平的设计。
In this paper, we experimentally investigate the phenomenon of electromagnetic wave tunneling through ϵ-negative (ENG) metamaterial layers surrounded by double-positive layers. Initial experiments are conducted by using a rectangular waveguide, which operates below its cutoff frequency to emulate an ENG layer. This ENG layer is then sandwiched by two dielectric substrates with relatively high dielectric constants and it is shown that the entire setup acts as a classical microwave filter with a second-order bandpass response. The power handling capability of this filter is examined experimentally using a high-power magnetron source with a frequency of 9.382 GHz, a pulse duration of 1 μs, and a peak power of 25 kW. Based on the results of this experiment, two methods for improving the power handling capability of these multi-layer structures are proposed. In particular, it is demonstrated that emulating the ENG layers with thin perforated metallic sheets with sub-wavelength holes significantly enhances their peak power handling capability. A prototype of such a device is designed, fabricated, and experimentally characterized and it is demonstrated that it can handle extremely high peak power levels. The results presented in this work are expected to be useful in designing microwave filters and frequency selective surfaces that can handle extremely high peak power levels.