Analysis of Current Distribution of MicrostripLines with Spectral Domain Approach

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.