ANSYS Electronic Desktop is the go-to simulation tool for high-frequency PCBs or RF structures. It provides all the tools necessary for circuit design into one package. The simple formatting and 3D modeling tool allows for easy structure design and accurate results. I've used Electronic Desktop for numerous circuit designs, and the results are the closest thing you can get to measured data
The learning curve for this type of design work is often steep, luckily Ansys provides numerous help docs to navigate the (often confusing) setup errors you encounter
This product allows us to go through extensive simulations of RF and microwave designs including antenna simulations and circuit design. It is vital to producing a working printed circuit board, and having it work on the first try.