In this paper, the problem of crosstalk of T-shapedmicrostrip line is studied by adopting PML-FDTD (Perfectly Matched Layer Finite-Difference Time-Domain) method for the first time and a effective crosstalk-suppression measure is presented in detail. Using PML-FDTD to compute the T-shaped microstrip line of different improved measure, the computation results indicate that opening an orifice on the T-shaped microstrip line can markedly reduce the crosstalk between T-shaped microstrip line and adjacent microstrip line. Then it comes to a conclusion that the structure parameters of improved T-shaped microstrip line have different influence on the crosstalk of different frequency band: That is, (1) the orifice distance S consumedly affects the low frequency characteristic of crosstalk. The crosstalk between microstrip lines is smaller when the value of S is becoming bigger. The reduction is 6dB at best; (2) the angle alpha consumedly affects the high frequency characteristic of crosstalk. If the value of alpha is smaller, the crosstalk between microstrip line become smaller correspondingly. The reduction is 10dB at best. Design guidelines of reducing crosstalk of T-shaped microstrip line are proposed in this paper.
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