Study On Equivalent Modeling Method Of PCB Radiation Interference Source

Just along with the development of the electronic products, the printed circuit board(PCB), which is the core elements of the products, produces more and more serious and complex electro-magnetic interference(EMI). And so it becomes increasingly difficult and even impossible to simulation modeling. In order to save the dilemma, this thesis presents the equivalent modeling method of the PCB emissions to reduce the difficulty of the simulation modeling, simplify the complexity of the modeling and improve the computational efficiency. Four main aspects have been included as follows:(1) This thesis has summarized the radiation source equivalent modeling method, and analyzed the possibility of the method being used for interfering resource equivalent modeling. As there is few research about the interfering resource equivalent modeling, and the research about the radiation source equivalent modeling is helpful for the interfering resource equivalent modeling, so we should look for means from the research of the radiation source equivalent modeling method. This paper has discussed four methods about the radiation source equivalent modeling: integral equation method, mode expansion method, equivalent current method and equivalent magnetic method, dipole array method. I will research the rationale of the four methods, and then analyze the possibility of the four methods to be used to the interfering resource equivalent modeling.(2) Equivalent modeling method based on electric dipole array. Reference the dipole array method, this paper improves the equivalent modeling method based on electric dipole array. The basic theoretical derivation process of the method has been given in this thesis from two aspects: modeling in the electric field and modeling in the magnetic field, and slickness saved the problem of radiated interference equipment. In the end, two simulation examples have been given to improve the veracity and the feasibility of the method.(3) Equivalent modeling method based on magnetic dipole array. Refer to the method of equivalent modeling based on electric dipole array, another basic antenna element: magnetic dipole has been utilized to set up the method of equivalent modeling based on magnetic dipole array. The basic theoretical derivation process of the method has been given in this thesis from two aspects: modeling in the electric field and modeling in the magnetic field, and slickness saved the problem of radiated interference equipment. After that, two simulation examples have been given to improve the veracity and the feasibility of the method. In the end, the good and bad has been contrasted between the method of equivalent modeling based on electric dipole array and the method of equivalent modeling based on magnetic dipole array.(4) The optimizing and the extension of the equivalent modeling method based on electric array. The influence of the height of the dipole array to the earth plate and the quantity of the magnetic of the dipole to the accuracy of the method of magnetic dipole array, and obtain some standard. And then propose a new mingle dipole array, which include the electric dipole and the magnetic dipole, and simulation examples have been given to improve the veracity and the feasibility of the method.