Frequency response bandwidth
fb = bandwidth(sys)
fb = bandwidth(sys,dbdrop)
fb = bandwidth(sys) computes the bandwidth fb of the SISO dynamic system model sys, defined as the first frequency where the gain drops below 70.79 percent (-3 dB) of its DC value. The frequency fb is expressed in rad/TimeUnit, where TimeUnit is the time units of the input dynamic system, specified in the TimeUnit property of sys.
For FRD models, bandwidth uses the first frequency point to approximate the DC gain.
If sys is an S1-by...-by-Sp array of models, bandwidth returns an array of the same size such that
fb(j1,...,jp) = bandwidth(sys(:,:,j1,...,jp))