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Estimation of high frequency scattered microwave electric field using the extended Born approximation [microwave imaging applications]

In this paper, we investigate and evaluate the performance of the extended Born approximation in a high frequency band, up to 18 GHz. We reformulate the EBA in terms of the dielectric constant. The scattered electric fields using the EBA are compared with the exact model. We demonstrate a guideline for choosing the grid size and discuss the dependence of the accuracy of EBA on size and permittivity of the anomaly. In addition, the EBA model is applied to the two anomalies case. In our work, the dielectric perturbation instead of conductivity perturbation is emphasized.