FieldSolver 3D

Powerful fully integrated simulator for designing antennas, verifying shielding or optimizing wired UHF communication.

Product Overview (see also: Video Tour)

Felicitas FieldSolver 3D is a powerful fully integrated simulation system for designing antennas, verifying shielding or optimizing wired UHF communications.

The simulation engine is based on state-of-the art FDTD (Finite Difference Time Domain) algorithms. The implementation is highly optimized and takes full advantage of modern multi-core workstations. Even large simulations are done quickly on well equipped personal computers.


FieldSolver 3D is a full 3D electromagnetic wave solver. Therefore any task which requires deep insight into electromagnetic wave propagation can be tackled.

Below we outline a number of the most frequent applications:

Antenna Design

The most important features of antennas are there radiation pattern, that is the gain in any direction and the matching, that is the input impedance at all frequencies of interest.

FieldSolver 3D is able to determine both in a single simulation run.

A challenge for any simulation system in doing antennas is usually the combined simulation of the near field and of the far field. The near field requires a very detailed look at small features and at rapidly changing fields. The far field is retrieved from places without structures far away from the antenna. FieldSolver 3D tackles this challenge in a number of ways:

Near- To-Far-Field Transformation (NTFFT)

A cubic volume is created which covers the complete antenna. From the field on the surface of that volume, the far field is calculated and visualized in 3D.

The advantage of that approach is that the simulation volume is comparatively small and can be simulated with high resolution.

True Sub Gridding

A sub grid is created which covers the radiation structures. The sub grid has a higher simulation resolution compared to the main grid in both space and time. The main grid is used to simulate the far field of the antenna.

This unique feature of FieldSolver 3D allows to simulate the antenna with high resolution and to retrieve the far field directly from the simulation.

PCB Layout

With todays frequencies of several 100MHz or even GHz, the layout plays a key role for a successful design. FieldSolver 3D is able to import layout data and simulate the behavior of vias and tracks.

Features of Vias and Tracks

The properties of Standard Microstrip and Stripline transmission lines can today be calculated from their geometries. But any discontinuity is beyond the scope of closed-form formulas.

The influence of vias to high speed signals can be simulated and visualized. This allows the designer to optimize the geometry of the vias (hole and pad diameters, feeding stub, placement). Losses are minimized and margins maximized.

Influence of Connectors

In many high-speed designs the connectors are the critical parts. They represent a discontinuity for the signal path and can be the cause for radiation.

FieldSolver 3D imports 3D data from the vendor of the connector and is able to simulate them together with the geometry of the feeding tracks. Reflections and can be visualized and root problems can be identified and rectified.

EMI / EMC Tasks

Electromagnetic interference can occur within a device or between devices.

EMI Within a Device

FieldSolver 3D can simulate the way how an aggressor signals couples into a victim. The designer gets deep insight into the mechanism involved and is able to create specific means for rectifying the problem. The success of the modifications can be verified in another simulation run.

EMI Between Devices

With a full 3D simulation, it is possible to identify the reason for unintended radiation of a device or the reason for sensibility to certain interfering frequencies.


System Requirements

  • LINUX 64 Bit or Windows ® 64 Bit
  • Quad-core processor, running at 2GHz or higher
  • Graphic card with OpenGL ® driver (NVIDIA ® and AMD ® are supplying suitable drivers for all of their cards)
  • 8GB of RAM
  • 40GB of HDD space

Working Principal

Maxwell Equations

FieldSolver 3D is based on an enhanced set of FDTD (finite difference time domain) algorithms. The basic forms the well known Maxwell equations in their differential form:


E : electric field (V/m)
H : magnetic field (A/m)
D: electric flux density (C/m² )
B : magnetic flux density (Wb/m² )
J : electric current density (A/m² )
ρ: free electric charge density (C/m³ )
Jm : equivalent magnetic current density (V/m² )
ρm : free magnetic charge density (Wb/m³ ).

(the triangle representing the “Del” or “Nabla” Operator:)


Simulation Grid Composed of Yee Cells

The simulation volume is build up in a special grid proposed by Kane Yee back in 1966 (“Yee Grid”). That grid holds the components of the E and H field (Ex, Ey, Ez, Hx, Hy, Hz) in different spatial locations. It allows to compute the partial derivations required to update the field very efficiently.