Microwave and RF simulation software.

Best value microwave and RF simulation software.

Microwave and Radio Frequency design and simulation software

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Simulate and design microwave and radio frequency circuits using scattering parameters or using the finite difference time domain method (FDTD), (excluding devices in FDTD).

What is Gapher?

Gapher is a Microwave and Radio frequency circuit design and simulation software with two simulation engines, a Scattering Parameter (S parameter) frequency domain simulation and a Finite Difference Time Domain mode (FDTD) all in one seamless package.
It calculates the dimensions of transmission lines, coupled transmission lines and radial stubs.
These are then placed on the Window as the copper tracks on the printed circuit board. The circuit is then simulated using one of two simulation modes.
In the Scattering mode the circuit is simulated using Scattering Parameters. This is a quick way of getting the frequency response of the Scattering parameters and matching components.
In the Finite Difference Time Domain mode, which is a time domain method, the circuit is simulated using Maxwell’s Equations and the simulation takes longer.
Lumped components, i.e. resistors, capacitor, inductor and devices with Touchstone formatted data, are simulated in the S parameter mode. Devices are not simulated in the FDTD mode.
The circuit can then either be printed on an ordinary printer onto paper or transparency as a mask for photo etching or be exported in Gerber into other printed circuit board software for addition into other circuits.


  • Scattering parameter simulation
  • Finite difference time domain (FDTD) simulation , excludes devices
  • Conjugate device matching
  • Design an amplifier to maximum available gain (MAG) or specific gain
  • Filter design
  • Amplifier for optimum or specified noise
  • Stability circles
  • Print circuit for PCB manufacture
  • Export Gerber format
  • Export graph data as CSV
  • Create PCB footprints of an IC
  • Copper pour on PCB


  • Lumped components i.e. resistors, capacitors and inductors
  • Micro-strip line
  • Coupled lines
  • Junction
  • Devices, any two port component with scattering parameters i.e. transistors bipolar or fet
  • Radial stub
  • Vias
  • Wire
  • Taper, diagonal lines