Abstract
A new discrete Green's function (DGF) formulation of the finite difference-time domain (FDTD) method is presented. The implementation of the DGF method does not require an absorbing boundary condition (ABC) because it can determine the field at any point, at any time step, directly from the current without computing the free space nodes in between. This makes it an ideal choice for application as an ABC for the FDTD grid. The DGF-FDTD method and Yee algorithm (see Yee, K.S., IEEE Trans. Antenna and Propag., vol.14, p.302, 1966) follow the same discrete scheme; they are two different exact solutions for the same problem and can be combined without any interfacing problems or numerical errors. The performance of the application of the DGF-FDTD method applied as an ABC is investigated, firstly using a simple point source located at the centre of the FDTD grid and secondly by its application to the modelling of a 2D waveguide. Evidence is given that the DGF-FDTD performance is comparable in accuracy to that obtained using PML, but has the advantage of being faster and less memory intensive.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
