CAJ | 학술논문

左手材料的研究是近年来的科研热点。电磁波在左手材料中的传播特性成为研究的主要方向之一。给出了柱坐标系下冷等离子体模型左手材料改进后的时域有限（FDTD）差分格式。利用得到的FDTD差分格式数值计算了不同厚度、不同折射率冷等离子体模型左手材料分别部分填充同轴线后TE模的归一化截止波数，并与正常材料部分填充进行比较。结果显示：左手材料部分填充同轴线后，其TE模截止波数随填充厚度和折射率绝对值的增大而增大，与正常材料填充的结果正好相反。展示了左手材料具有奇异的电磁特性，为左手材料的研究提供数据基础。
좌수재료적연구시근년래적과연열점。전자파재좌수재료중적전파특성성위연구적주요방향지일。급출료주좌표계하랭등리자체모형좌수재료개진후적시역유한（FDTD）차분격식。이용득도적FDTD차분격식수치계산료불동후도、불동절사솔랭등리자체모형좌수재료분별부분전충동축선후TE모적귀일화절지파수，병여정상재료부분전충진행비교。결과현시：좌수재료부분전충동축선후，기TE모절지파수수전충후도화절사솔절대치적증대이증대，여정상재료전충적결과정호상반。전시료좌수재료구유기이적전자특성，위좌수재료적연구제공수거기출。
In recent years, the left-handed materials are so widely studied in scientific research so that its radio-wave propagational characteristics become an important problem. This paper presents the improvement of difference scheme of FDTD for calculating cold plasma model of left-handed materials in cylindrical coordinate system. The normalized cut-off wavenumber of TE-mode of the coaxial line filled with cold plasma model of left-handed materials with different thickness, different refractive index is calculated by FDTD method, and a result of comparison with the normal material partially filled is given. The result shows: after the cold plasma model of left-handed materials partly filled in the coaxial line, the normalized cut-off wavenumber of TE-mode is increased along with the increasing thickness and refractive index absolute value of left-handed materials, the result of the normal materials filling is in the opposite. The fantastic electromagnetic characteristics of left-handed materials is showed, and provides the data base for studying left-handed materials.