This chapter describes calibration using the triple offset short (SSST) algorithm. The next step in this progression is to remove the load so that the entire reflection space is defined by three shorts of varying offset lengths. The individual short definitions are the same as for an SOLT calibration.
A generalization of this approach is multiple offset short (mSSS) where up to 10 different shorts can be used per port to extend bandwidth and improve immunity to repeatability challenges. This mSSS calibration uses a least-squares solving approach to optimize the weighting of the calculation at each frequency.