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The T-matrix approach is efiective in analyzing electro- magnetic scattering from flnite scatterers. Yet for scatterers with ex- treme geometry, this approach may fail. One example is its inability to analyze scattering from dielectric cylinders with large aspect ratios. To deal with such di-culty, recently we proposed a method based on an extension of the T-matrix approach, where a long cylinder is hy- pothetically divided into a cluster of identical sub-cylinders, for each the T matrix can be numerically stably calculated. Special care was paid to fulflll the boundary conditions at the hypothetic surface of any two neighboring sub-cylinders. The resultant coupled equations are difierent from that of multi-scatterer theory. The model results were in good agreement with experiment data available in the liter- ature. However, the validity region of the proposed method was not fully characterized. Now we have developed and validated a method of moment (MoM) code, and are in a position to carry on the task of

CHARACTERIZATION OF THE VALIDITY REGION OF THE EXTENDED T-MATRIX METHOD FOR SCATTERING FROM DIELECTRIC CYLINDERS WITH FINITE LENGTH