金属膜对单介质板太赫兹波导传输特性的影响

摘要

理论分析了对称金属薄膜镀层对厚单介质板太赫兹波导TM模传输特性的影响，发现镀膜前后TM模损耗相差巨大，并且随太赫兹频率的增加TM模损耗差异会更大。对低损耗厚单介质板，金属膜对TM模损耗的影响不可忽视。进一步研究了镀膜对TM模模场分布的影响，发现镀膜前后厚单介质板内TM模模场分布显著不同。%The effect of a symmetrical metal film on the transmission characteristics of TM mode in the thicker single-dielectric-slab THz waveguide is analyzed theoretically. It is found that the coating of metal film results in huge differ-ence in the attenuation coefficients of TM mode,and attenuation difference of TM mode increases with the increase of the THz frequency. For a thicker single-dielectric-slab THz waveguide with low absorption loss,the influence of metal film on the loss of TM mode can′t be ignored. The influence of metal film on the mode field distribution of TM mode is further studied,and it is found that the mode field distribution of TM mode in the thicker dielectric slab is varied significantly after coating.