Abstract
This paper is dealing with a time-frequency modeling method of electromagnetic (EM) near-field (NF) radiated by electronic devices excited by transient pulse signals. The model developed enables to calculate the EM NF maps at different distances from the given device and also the synthesis of radiation sources enabling to reproduce the field maps. The method proposed is based on the ultra wide band (UWB) frequency model of EM NF maps. The number of EM NF maps can be reduced by considering an innovative algorithm in order to establish simply the dipole model. Then, the transient model can be realized by considering the convolution between the transient excitation signals and the dipole-array model. The method proposed was validated by a standard 3D EM tool with a planar microstrip device excited by microwave signal modulating 1.25-GHz-carrier with 0.5-GHz-bandwidth. As expected, good correlation is found between results from simulation and the investigated modelling method. The method introduced in this paper is particularly useful for the investigation of time-domain emissions for EMC applications by considering transient EM interferences (EMIs).
Highlights
With the emergence of the hybrid technology integrated with multifunction, the issues related to the electromagnetic interference (EMI) [1,2,3,4,5,6,7,8,9] and electromagnetic compatibility (EMC) [10,11,12,13,14] become a primary importance during the manufacturing of the electrical and electronic circuits
Two different processing methods are presented in this paper: (i) The NF/NF transform in the time-domain by using the plane wave spectrum (PWS) theory and (ii) a modelling of the NF radiation with dipole-array in the timedomain
This time-dependent model is based on the ultra wide band (UWB) frequency model of EM NF maps using a set of elementary dipoles
Summary
With the emergence of the hybrid technology integrated with multifunction, the issues related to the electromagnetic interference (EMI) [1,2,3,4,5,6,7,8,9] and electromagnetic compatibility (EMC) [10,11,12,13,14] become a primary importance during the manufacturing of the electrical and electronic circuits. Two different processing methods are presented in this paper: (i) The NF/NF transform in the time-domain by using the plane wave spectrum (PWS) theory and (ii) a modelling of the NF radiation with dipole-array in the timedomain. The NF extraction method proposed in this paper is based on the PWS theory [71,72,73,74,75,76] combined with the plane wave propagation properties and FFT. The PWS theory is known as the formulation allowing to decompose any field as a sum of plane waves propagating in all directions It is widely used for predicting the radiation for EMC application. Calculation of PWS at z=zd Pe,Ph(k x,k y,f)z=zd= Pe,Ph(k x,k y,f)z=z0exp[-jk z(z d-z 0)]
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