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中文摘要：
用改进的谱域法分析微带线的电流分布特性，并用切比雪夫多项式做基函数来表示切向电流分布，得到了较宽频率范围内的切向电流分布特性，再根据这些特性在不同频段上取适当数量的基函数对有效相对介电常数进行了计算，与其他数值计算方法相比，该方法不仅可以得到高精度的计算结果，还可以在相应频段减少计算时间，计算结果与HFSS仿真结果在h/λ0≤0．7范围内很接近。
英文摘要：
The current distribution characteristics of microstrip lines are investigated with the improved spectral domain analysis method. The Chebyshev polynomial as basis functions is used to generate the expression for the tangential current distributions on microstrip lines, tangential current distribution characteristics within wider frequency range are obtained, and the effective relative permittivity is calculated with required basis functions in different range of frequency. Compared with the other numerical methods, this method can not only obtain high accurate results but also reduce the compute time in the corresponding frequency band. Simulation results showa good agreement with the calculated results within the range of h/λ0 ≤ 0.7.
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