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An affordable HFSS alternative for PCB RF design

Short answer
For PCB antennas, filters, and transmission lines, RayRF is a GUI GPU FDTD simulator at 1,499 USD per year for commercial use, against published HFSS figures of 5,000 to 50,000 USD per year. RayRF does far less than HFSS overall, but it covers most planar PCB RF work and you can run it the same day.

HFSS is excellent. It is also priced and scoped for organizations that do RF as a core business. A lot of people pay for the full thing and use a slice of it: a patch antenna, a coupled-line filter, a CPW transition. If that is you, the question is whether you need the whole suite or just that slice done quickly.

What you are really paying for with HFSS

HFSS is a mature 3D finite-element solver with arbitrary geometry, mode ports, multiphysics coupling, and decades of validation behind it. For complex 3D problems, large arrays, or work that has to clear a formal review, that depth is the point and RayRF is not a substitute.

Where RayRF fits

RayRF is narrow on purpose. It is built for planar PCB RF and it tries to make that loop fast: draw or import a board, set the stackup and ports, slide a quality preset, and click Run. The solver runs on your NVIDIA GPU and the S-parameters update live. Smith chart, radiation patterns, fields, and surface currents are all in the same window.

A scope and cost comparison, not a speed or accuracy benchmark. The HFSS license forbids publishing comparative benchmarks, so we do not.
RayRFHFSS
MethodFDTD (time domain)FEM (frequency domain)
FocusPlanar PCB RFGeneral 3D EM + multiphysics
InterfaceNative GUI editorNative GUI editor
Solver hardwareNVIDIA GPU + CPU fallbackCPU + optional GPU
Commercial price1,499 USD / year~5,000 to 50,000 USD / year (published third-party figures)
Free trial30 days, no cardSales process
Honest framing
The pitch is not that RayRF beats HFSS. It is that if you are paying enterprise prices for 20 percent of an enterprise tool, a focused tool that does that 20 percent quickly may serve you better for a fraction of the cost. If you need the other 80 percent, keep HFSS.

Who should switch, and who should not

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

About accuracy

A cheaper tool is only useful if the answer is right. RayRF is validated against 43 structures measured on a physical VNA, with many resonances matching within 1 percent across the band. The full method and the overlaid plots are on the validation page. For the speed story we benchmark against openEMS, which is open source and permits it, in the matched-mesh benchmark.

Frequently asked questions

What is a cheaper alternative to Ansys HFSS for PCB RF?
RayRF is a GPU FDTD simulator built for planar PCB RF, priced at 149 USD per month or 1,499 USD per year for the commercial tier, with a 30-day free trial. Published third-party figures put HFSS in the 5,000 to 50,000 USD per year range. RayRF does less than HFSS but covers most PCB antenna, filter, and transmission-line work.
Does RayRF do everything HFSS does?
No. HFSS is a mature 3D finite-element solver with deep multiphysics, arbitrary 3D geometry, and a huge feature set. RayRF focuses on planar PCB structures and FDTD. If you need full 3D, mode ports, or multiphysics coupling, HFSS or a similar enterprise tool is the right tool.
Why do you not publish a speed benchmark against HFSS?
The HFSS license forbids publishing comparative benchmarks of the software. We respect that, so we benchmark against openEMS, which is open source, and validate RayRF against physical VNA measurements instead.
Is RayRF accurate enough to trust for real work?
RayRF is validated against 43 structures measured on a physical VNA, with many patch and filter resonances matching within 1 percent across the band. Whether that is enough depends on your margins. The full method and plots are on the validation page.
Try RayRF on your own design

Draw a board, slide the quality preset, and click Run. 30-day free trial, no card required. Windows and Linux.

Start the free trial
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