Phase shifter and phased-array antenna

The invention provides a phase shifter and a phased-array antenna, and belongs to the technical field of communication. The invention discloses a phase shifter. Included are: a substrate, signal transmission unit, the semiconductor device includes a signal transmission unit, a phase adjustment unit, at least one semiconductor unit disposed between the signal transmission unit and the phase adjustment unit, a first insulating layer disposed at least between the phase adjustment unit and the semiconductor unit, and at least one first bias line configured to be electrically connected to the phaseadjustment unit, wherein the orthographic projection of the first insulating layer on the substrate is not smaller than the overwrapping area of the orthographic projections of the phase adjustment unit and the semiconductor unit on the substrate. According to the phase shifter provided by the invention, the semiconductor unit is configured to adjust the phase of a microwave signal according to the bias voltage applied b