Gürel, LeventUğur, O.2019-02-022019-02-022000-040018–926Xhttp://hdl.handle.net/11693/48756Techniques to improve the accuracy of the finite-difference time-domain (FDTD) solutions employing sinusoidal excitations are developed. The FDTD computational domain is considered as a sampled system and analyzed with respect to the aliasing error using the Nyquist sampling theorem. After a careful examination of how the high-frequency components in the excitation cause sinusoidal steady-state errors in the FDTD solutions, the use of smoothing windows and digital low-pass filters is suggested to reduce the error. The reduction in the error is demonstrated for various cases.EnglishTerms—AliasingDigital filtersElectromagnetic scatteringFinite-difference time-domainIncident-field arraySamplingSignal processingSmoothing windowsArticle10.1109/8.843673