| THz波段介质涂敷空芯金属圆波导的传输特性 |
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| 引用本文： | 黄斌科,赵重峰.THz波段介质涂敷空芯金属圆波导的传输特性[J].强激光与粒子束,2013,25(3):667-670. |
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| 作者姓名： | 黄斌科 赵重峰 |
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| 作者单位： | 1.西安交通大学 电子与信息工程学院, 西安 71 0049 |
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| 基金项目： | 中央高校基本科研业务费专项资金项目 |
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| 摘 要： | 针对THz波段介质涂敷空芯金属圆波导传输特性的精确分析问题，基于波导中场方程及边界条件建立关于传播常数的特征方程，并且采用改进的Muller法求解特征方程得到涂敷圆波导主模HE11模的传播常数。计算中对THz波段的非理想导体电导率采用经典弛豫效应模型。仿真结果表明:内径为1.8 mm的银波导，当聚苯乙烯涂敷层厚度为17 m时，HE11模在1.5~3.0 THz的衰减常数在1 dB/m以下，且具有较好的色散特性；内径为2.2 mm的银波导，在2.5 THz时其衰减常数随涂敷层厚度的增加先增大后减小，且存在最佳介质涂敷层厚度，可实现THz波低损耗传输。
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| 关 键 词： | THz波 圆波导 介质涂敷 特征方程 |
| 收稿时间： | 2012-07-11 |
Propagation properties of dielectric-lined hollow cylindrical metallic waveguides for THz waves |
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| Huang Binke,Zhao Chongfeng.Propagation properties of dielectric-lined hollow cylindrical metallic waveguides for THz waves[J].High Power Laser and Particle Beams,2013,25(3):667-670. |
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| Authors: | Huang Binke Zhao Chongfeng |
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| Affiliation: | 1.School of Electronics and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China |
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| Abstract: | For the rigorous analysis of the propagation properties of dielectric-lined hollow cylindrical metallic waveguides operating in the THz range of frequencies, the characteristic equation for propagation constants is derived from the electromagnetic field equations and the boundary conditions of the dielectric-lined waveguides. The propagation constant of the dominant hybrid HE11 mode can be obtained by solving the characteristic equation with the improved Muller method. The classical relaxation-effect model for the conductivity is adopted to describe the frequency dispersive behavior of normal metals for the metallic waveguide wall. For a 1.8 mm bore diameter silver waveguide with the inner surface coated with a 17 m-thick layer of polystyrene(PS) film, the transmission losses of HE11 mode can be reduced to the level below 1 dB/m at 1.5~3.0 THz, and the dispersion is relatively small for HE11 mode. In addition, with the PS film thickness increasing, the transmission losses of HE11 mode increase first and then decrease for a 2.2 mm bore diameter silver waveguide at 2.5 THz, and the minimum loss can be achieved by adopting the optimum dielectric layer thickness. |
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