Low-Frequency Stabilisation

At very low frequencies (frequency range where the largest dimension of the model is much smaller than a wavelength), the method of moments (MoM) solution can become numerically unstable and singular.

The default MoM solution uses single precision. When using double precision, the MoM solution is valid for lower frequencies than for single precision. If the solver gives a warning about the matrix stability when using double precision, then it is recommended to use low-frequency stabilisation.

Note: Low-frequency stabilisation is not required at higher frequencies and increases the runtime. Double precision uses double the memory of single precision.