Patent ID: 8314742

Claim:
An antenna device comprising: a beam forming unit which forms differently directed beams of electromagnetic waves and which includes an antenna surface for transmission and reception of said electromagnetic waves and a plurality of beam ports for input and output of radio frequency electrical signals; at least two transmission signal adjusting units, each of which is coupled to a respectively corresponding one of said beam ports, and each of which adjusts at least one of amplitude and phase of signals being supplied to the beam forming unit via that beam port; a transmission signal supplying unit that supplies transmission signals to each of the at least two transmission signal adjusting units; a first beam control unit that sets an adjustment to be effected by each of the at least two transmission signal adjusting units so as to produce transmission beams formed by the beam forming unit having directivity along a thereby specified direction; at least two reception signal adjusting units, each of which is coupled to a respectively corresponding one of said beam ports, and each of which adjusts at least one of amplitude and phase of signals being outputted from the beam forming unit via that beam port; a reception signal producing unit that produces reception signals by synthesizing signals which are adjusted by the at least two reception signal adjusting units; and a second beam control unit that sets an adjustment to be effected by each of the at least two reception signal adjusting units so as to produce reception signals from the reception signal producing unit received by reception beams having directivity along said specified direction, wherein, in the beam forming unit, the plurality of beam ports are symmetrically located with respect to a plane perpendicular to an array direction thereof, and wherein the at least two beam ports used for transmission are spatially located inside the at least two beam ports used for reception.