ANSYS HFSS Hybrid Finite Element – Integral Equation Method (FE-BI) Solver


Built upon HFSS domain decomposition and 3-D integral equation technology, the FE-BI technique provides an ideal open truncation for the HFSS finite element solution using a direct integral equation-based calculation of an open boundary condition. FE-BI combines the best of both methods: the finite element method’s ability to handle complex geometries along with the method of moments’ direct calculation of the free-space Green’s function for accurate radiating and scattering solutions. With this technology, antenna designers can realize increased accuracy for radiated far-field solutions to deliver more confidence in electromagnetic solutions. Simulations involving antenna platform integration can be significantly reduced in size by allowing a conformal radiation boundary, including concave geometries, that reduces the overall volume of the finite element domain.


Smart phone in vehicle including effects from human body using HFSS hybrid solver. The FE-BI technique combines finite elements (FEM) for phone, integral equations (IE) for solving dielectric of human body, and conductor of aluminum car chassis and FE-BI to couple results between FEM and IE solvers.

3-D far-field gain patterns for VHF (tail) and UHF (underside) antennas showing modulation due to motion of rotors. The hybrid FE-BI solver provides a 17-times and five times more-efficient solution for memory and time (respectively), as compared to FEM alone.