To solve the problem of the crosstalk suppression between adjacent microstrip lines on the current printed circuit board,an electromagnetic compatibility design was presented.In this design,periodic coupling branches was utilized to suppress far-end crosstalk on microstrip lines in the ultra-wideband frequency range.Based on the causes of the crosstalk formation,the periodic open-circuit branching was further combined with I-beam coupled branching.The periodic open-circuit branches were loaded in the longitudinal direction of the conventional microstrip lines,and periodic I-beam coupled branches were loaded between two neighboring microstrip lines.The open-circuit branches on the microstrip lines and coupling branches between the lines were used in order to increase the equivalent self-inductance and the equivalent mutual capacitance of the microstrip lines and reduce the equivalent mutual inductance of the lines,which significantly reduced the intensity of the far-end crosstalk.In addition,the reduction of the equivalent mutual inductance between the lines could suppresse the rise in near-end crosstalk due to the increase in the equivalent mutual capacitance.The full-wave test results show that the distal crosstalk intensity of adjacent microstrip lines is reduced to less than-48 dB in the range of 1 GHz to 20 GHz,and the physical structure does not involve metallized vias,which has the characteristics of simple geometric structure,low cost and large wiring space.
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