Project Highlight

Propagation & Scattering Group

Advanced prediction tools for EM wave propagation and scattering problems

This research area covers several projects as follows:

P1. Advanced Prediction Tools for EM Scattering from Complex Air Intakes
TL@NUS has studied and developed several methods to model EM scattering from an air intake. These include Higher Order Finite Element - Boundary Integral (FEBI) method; Higher Order FEBI-Domain Decomposition Method (DDM); and the Field Iterative Method (FIM). The Higher Order FEBI algorithm is currently one of the most versatile and efficient algorithms for the study of interior scattering from a complex air intake. The Higher Order FEBI-DDM provides a very efficient and flexible way to model total scattering from a general body with complex cavity structure. The FIM is a highly efficient algorithm for large air intake. Parallel implementation of these methods will greatly enhance their capabilities.

P2. Parallel Adaptive Integral Method Code for Efficient Modeling of Scattering from Large PEC Targets
TL@NUS has developed PC-cluster based Parallel Adaptive Integral Method (AIM) Code using Combined Field Integral Equation (CFIE) for efficiently modeling EM scattering from closed PEC targets.

P3. Novel Higher Order MoM Using NURBS Model for Efficient Modeling of Scattering from PEC Targets
TL @NUS has developed an efficient Higher Order MoM tool for modeling scattering from PEC targets. This tool has been implemented using higher order basis function defined on non-uniform rational B-splines (NURBS) model. NURBS is capable of conformally describing complex objects with much larger curved patches than bilinear quadrilaterals (BQ), and no factitious geometric discontinuities are introduced between adjacent patches. As a result of combining NURBS model with higher order MoM, the developed tool can accurately simulate scattering from PEC target using fewer number of unknowns.

P4. Domain Decomposition Method for Conformal Antenna Arrays
This is a collaborative project with the ElectroScience Laboratory, Ohio State University (OSU), USA. The principal investigator is Professor J. F. Lee. This project is a continuation of a previous collaboration project on domain decomposition method (DDM) for EM modeling. The goals of this project are to further research and develop the novel DDM, developed at Computational Science Group (CSG) at the OSU, into solving large conformal antenna arrays. The R&D efforts include: extending DDMs to treat rotational and mirror symmetries, incorporating exact integration of the cement element matrices, developing higher order transmission conditions, handling anisotropic material tensors, and implementing geometrical non-conforming domain decomposition in multilayered medium.