An affordable HFSS alternative for PCB RF design

HFSS is priced and scoped for organizations that do RF as a core business. A lot of engineers pay for the full suite and use a slice of it: a patch antenna, a coupled-line filter, a CPW transition. If that is your work, the question is what that slice should cost and how fast it should turn around.

Scope

HFSS is a mature 3D finite-element solver with arbitrary geometry, mode ports, multiphysics coupling, and decades of validation. For complex 3D assemblies, large arrays, or work that has to clear a formal review mandating a specific tool, that depth is the point and RayRF is not a substitute. RayRF is narrow on purpose: planar PCB RF, drawn or imported in a layer editor, meshed automatically from one quality preset, solved on your NVIDIA GPU with S-parameters updating live, and post-processed in the same window.

The argument is arithmetic, not superiority: if you are paying enterprise prices for 20 percent of an enterprise tool, a focused tool that does that 20 percent quickly costs a tenth as much and iterates faster. If you need the other 80 percent, keep HFSS.

Who should switch, and who should not

• Use RayRF if your work is mostly planar PCB RF, you have an NVIDIA GPU, and iteration speed matters more than a deep 3D feature set.
• Stay on HFSS if you need arbitrary 3D geometry, multiphysics, mode ports, or sign-off that mandates it.

Accuracy

RayRF is validated against hardware: 43 structures across 4 fabricated PTFE boards, measured on a VNA, with resonant and pole frequencies tracking within 1-2% at the higher mesh refinements. The overlaid plots are on the validation page and the method is in the measurement write-up. For speed, the openEMS license permits benchmarking, so that comparison is published in full in the matched-mesh benchmark: 173.7x on the GPU, same mesh, same machine.