PHASED ARRAY ANTENNA AND ITS PHASE CALIBRATION METHOD

摘要

A phase array antenna includes an oscillator, a plurality of antenna elements, a phase shifter, a distributor, a receiving unit, and a control processor. The control processor performs a calibration process to select, from the antenna elements, a reference and target antenna elements to allow the radio waves generated by the oscillator to be provided for the reference and target antenna elements via the distributer, obtain a pattern of a change in a received power of radio waves received at the receiving unit, when a phase of the phase shifter for the reference antenna element is fixed and a phase of the phase shifter for the target antenna element is changed, extract, from the pattern obtained, the phase of the phase shifter for the target antenna element at which the received power becomes a local minimal value, and add the phase extracted to 180° to set its resultant value to a calibration value for the phase of the phase shifter for the target antenna element.