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 becomes numerically unstable and singular.

The traditional MoM solution using single precision is only valid at frequencies at about 1 MHz or greater. When using double precision, the MoM solution is valid for frequencies at about 100 Hz and greater. Enable low-frequency stabilisation when solving a model at very low frequencies when the matrix number starts to deteriorate to ensure a valid solution over the full frequency range.