The wavelet expansion method was used to analyze three-dimension (3-D) plan
ar problem. The structure is a combination of planar sheets of current orie
nted along normal and transverse directions in a stratified medium. The sur
face integral equation was solved through a Galerkm's method with unknown c
urrent expanded in terms of two-dimension orthogonal wavelets. The differen
t resolution levels of wavelet were chosen in accordance with the different
lengths of the conducting plates. Finally, a comparison was presented betw
een the wavelet expansion method and conventional method of moments to judg
e their efficiency.