Ferrite switches (ELF series) for the V-band, E-band, and W-band will become available from Harp Technologies in H2/2021. They will be supplied with WR15, WR12, and WR10 interfaces, respectively. ELF switches are based on a latching ferrite circulator that applies an external latching topology, i.e., the electromagnetic circuit is outside the circulator. The circuit is driven by a pulse from a Switch Control Unit (SCU), i.e., the switch requires power only when actuated. Several switches can be combined to form a switch network. The bandwidth of the switches is approx. 3-4 % at room temperature and the centre frequency is customer-definable upon order. The switches can be ordered with or without the SCU.