| The electromagnetic radiation and coupling of Printed Circuit Board (PCB) wasstudiedbasedontheBLTequation.First, we deduced the time domain BLT equation of the lossy two-conductortransmission line based on the frequency domain BLT equation, gave the mathematicexpressionoftransient parameterand the calculationformulaof non-liner loadtransientreflection coefficient, then we obtained the calculation method of time domain BLTequation.Second, we deduced the frequency domain analytic expression of the travelingwaveradiationfieldofprintedlineinthePCB,analyzedtheaffectionofradiationangle,line distance, and radiation radius to the far field through simulation numericalcalculation; and deduced the time domain calculation formula of the traveling waveradiation field of printed line by applying the Laplace transformation through thefrequency domain analytic solution of the traveling wave radiation field; for liner andnonlinear load linked to printed line terminal, we analyzed and calculated the transientradiation field respectively; for the case of liner load, we compared the distributioncharacter of frequency domain far radiation field to which of the transient far radiationfield by applying the data of simulation calculation obtained formerly , and we foundthattheresultisconsistent.Finally, we gave the load coupling response voltage formula of printed line in thePCB under the excitation of conventional interference source, for liner and nonlinearloadlinkedtoprintedlineterminal,weanalyzedandcalculatedtheaffectionofthePCBparameter to the terminal coupling response; under the circumstance of dielectricleakage, we analyzed and calculated affection of the dielectric loss to the terminalcoupling response; then we deduced the load coupling response voltage formula of theprinted line in the PCB under the excitation of incidence field, and we analyzed theaffection of the angle parameter (incidence angle and polarization angle) to the loadcouplingresponse. |
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