Phase controlled microwave array antenna - has additional phase shifter control to reduce overall phase error (NL 30.7.79)

摘要

The individual antennae of the microwave aerial array are arranged in pairs (32, 32'; ....) around a central axis (30, 35) and fed through a distributor (33) from a transmitter (31). Each circuit contains a controlled phase shifter (40, 42, 42'; ....), and alternate antennae have an additional shifter (41, 43, 45, 47). The additional phase shifting elements give a displacement equal to half that of the lowest bit of the controlled digital phase shifters (40; 42, 42'; ...). The aerial elements of one gp. thus always have a phase shift of a multiple of the lowest phase shift bit w.r.t. the other gp.