Analysis of radiated emissions from PCB using broadband Green's function method

In this paper, we present the application of broadband Green's function with low wavenumber extraction (BBGFL) to fast modeling of the radiated emissions from power structures of printed circuit boards (PCBs) for electromagnetic interference/compatibility (EMI/EMC) analysis. We use the BBGFL to compute the Green's function over broadband frequencies along the boundary walls of arbitrarily shaped power/ground planes. The broadband Green's function is based on modal expansions with low wavenumber extraction. Because the modal expressions are independent of frequencies, they are computed once and used for all frequencies. Then the radiated fields are readily derived from the fields on boundary walls using the equivalent principle. The accuracy and computational efficiency of the present method are compared with the method of moment (MoM) and commercial tool HFSS. The results of radiated emission of BBGFL are in good agreement with MoM and HFSS. But the method of BBGFL is several hundred times faster than direct MoM and HFSS for broadband simulations.