Figure10 Fabricated sample of measuring the far-end crosstalk (S41)
The results of HFSS simulation and physical test are shown in Figures 11 and 12 respectively. Figure 11 shows the magnitude of far-end crosstalk between coupled microstrip lines. The far-end crosstalk between microstrip lines is significantly smaller after etching TL-shaped DMS, and TL-shaped DMS has excellent ability to suppress far-end crosstalk. Therefore, TL-shaped DMS in the 0-8GHz band can effectively suppress the far-end crosstalk between coupled microstrip lines, and the maximum reduction of the far-end crosstalk between coupled microstrip lines can reach 42dB. There is a slight deviation between the simulation results and the test results, which is mainly caused by the error of the dielectric constant of the samples, but the trend of two results are almost identical. The crosstalk reduction method based on the TL-shaped DMS is compared with other crosstalk reduction methods using DMS, and the results are shown in Table 1. It can be seen that the TL-shaped DMS adopted in this paper is most effective in suppressing far-end crosstalk under the condition of relatively simple structure.