Accurate approximation of the current on a smooth scatterer in 2D

• The integral equations of high frequency electromagnetic scattering can be solved by means of the method of moments. In the case of smooth scatterers, it is feasible to factorise the surface current into an oscillating part and a slowly varying part.In this study, a Fourier transform technique is used for accurate approx- imation of the oscillating part. The complex wave number and the cor- responding amplitudes for the decay in the shadow zone are extracted by means of an extension of the symmetric discrete Fourier transform. This approximation is used as an oscillatory scaling in the method of moments. Substantial improvement of the accuracy is obtained with a small number of basis functions for both convex and concave scatterers. The scatterers have a moderate variation in the curvature. 

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)

Nyckelord

Waves and Signals

Vågor och signaler

Publikations- och innehållstyp

vet (ämneskategori)

ovr (ämneskategori)