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

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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.

BMW-phone

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.