A genetic algorithm based method for source identification and far-field radiated emissions prediction from near-field measurements for PCB characterization

A new method for predicting the far-field radiated emissions and for finding the radiation sources of a device from near-field measurements is presented. It is based on the substitution of the original device by an equivalent set of elemental dipoles, placed over the main radiating sources, which radiate the same near-field (and therefore, far-field). This equivalent set of elemental dipoles is generated using a genetic algorithm. From the position and type of the equivalent elemental dipoles, the position of the actual radiating sources is determined. Since the field produced by an elemental dipole is known, the far-field radiation of the actual radiating source can be calculated. The new method has been tested using synthetic data and real measurements from the radiation generated by a modem PCB demonstrating its viability and usefulness.

[1]  Mustafa Kuzuoglu.  Source identification by Lagrange multipliers , 1994, Proceedings of IEEE Antennas and Propagation Society International Symposium and URSI National Radio Science Meeting.

[2]  A. Yaghjian.  An overview of near-field antenna measurements , 1986 .

[3]  Marco Donald Migliore,et al.  An effective near-field far-field transformation technique from truncated and inaccurate amplitude-only data , 1999 .

[4]  T. Sarkar,et al.  Planar near-field to far-field transformation using an equivalent magnetic current approach , 1992 .

[5]  E. Michielssen,et al.  Multiple source localization using genetic algorithms , 1996, Journal of Neuroscience Methods.

[6]  J.-R. Regue,et al.  A genetic algorithm based method for predicting far-field radiated emissions from near-field measurements , 2000, IEEE International Symposium on Electromagnetic Compatibility. Symposium Record (Cat. No.00CH37016).

[7]  David E. Goldberg,et al.  Genetic Algorithms in Search Optimization and Machine Learning , 1988 .

[8]  A. Devaney,et al.  The inverse source problem of electromagnetics: linear inversion formulation and minimum energy solution , 1999 .

[9]  Mark Ma,et al.  Emission Characteristics of Electrically Small Radiating Sources from Tests Inside a TEM Cell , 1981, IEEE Transactions on Electromagnetic Compatibility.

[10]  Tapan K. Sarkar,et al.  Planar near-field to far-field transformation using an array of dipole probes , 1994 .

[11]  Tapan K. Sarkar,et al.  Near-field to near/far-field transformation for arbitrary near-field geometry utilizing an equivalent electric current and MoM , 1999 .

[12]  R. Pierri,et al.  A two probes scanning phaseless near-field far-field transformation technique , 1999 .

[13]  G. I. Costache,et al.  Far-field predictions from near-field measurements using an exact integral equation solution , 1994 .

[14]  Guy A. E. Vandenbosch,et al.  Simulation of an EMC reference site in a near-field antenna range , 1993 .

[15]  Peter W. F. Wilson.  On simulating OATS near-field emission measurements via GTEM cell measurements , 1993, 1993 International Symposium on Electromagnetic Compatibility.

[16]  Tapan K. Sarkar,et al.  Near-field to near/far-field transformation for arbitrary near-field geometry, utilizing an equivalent magnetic current , 1996 .

[17]  G. Franceschetti,et al.  On the spatial bandwidth of scattered fields , 1987 .

[18]  Giovanni Leone,et al.  Radiation pattern evaluation from near-field intensities on planes , 1996 .

[19]  D. Hill,et al.  A three-loop method for determining the radiation characteristics of an electrically small source , 1992 .

[20]  John H. Holland,et al.  Adaptation in Natural and Artificial Systems: An Introductory Analysis with Applications to Biology, Control, and Artificial Intelligence , 1992 .

[21]  E.M. Petriu,et al.  3-D electromagnetic field modeling based on near field measurements , 1996, Quality Measurement: The Indispensable Bridge between Theory and Reality (No Measurements? No Science! Joint Conference - 1996: IEEE Instrumentation and Measurement Technology Conference and IMEKO Tec.

[22]  Raffaele Martone,et al.  A Lagrangian approach to shape inverse electromagnetic problems , 1996 .