Phase tuning methods for transmission lines

Abstract

Methods for phase tuning transmission lines and phase tunable transmission lines are disclosed. According to one aspect, a Single Sub-Array Antenna Filter Unit (SSA-AFU) includes an antenna calibration (AntCal) circuit configured to couple a signal between a sub-array of antenna elements and a calibration port via a tunable transmission line. A tunable transmission line between the AntCal circuit and the calibration port includes at least one tuning screw configured to adjust a capacitance of the tunable transmission line to adjust a phase of signals transported by the tunable transmission line. The calibration port is configured to receive a signal transported by the tunable transmission line.

Dependencies are inferred from the claim text.