Antenna device and antenna adjustment method

An antenna device comprising:

• a main reflector;
• a sub-reflector including sub-reflector panels and having a reflecting surface facing a reflecting surface of the main reflector;
• a primary emitter to receive a radio wave reflected by the sub-reflector;
• sub-reflector panel drive mechanisms coupled to and configured to drive the corresponding sub-reflector panels;
• a phase calculator to
• calculate a relative phase of an element electric-field vector corresponding to each of the sub-reflector panels based on a change in received electric-field strength of the radio wave received by the primary emitter during driving of the sub-reflector panel drive mechanisms, and
• determine positions of the sub-reflector panels at which a phase distribution on an aperture surface of the main reflector is minimized;
• and
• a storage to store position information of positions of the sub-reflector panels that are determined by the phase calculator after moving the main reflector in elevation directions in advance,
• wherein the phase calculator determines the positions of the sub-reflector panels based on the position information stored in the storage and an elevation angle of the main reflector.

An antenna device comprising:

• a main reflector;
• a sub-reflector including sub-reflector panels and having a reflecting surface facing a reflecting surface of the main reflector;
• a primary emitter to receive a radio wave reflected by the sub-reflector;
• sub-reflector panel drive mechanisms coupled to and configured to drive the corresponding sub-reflector panels;
• a phase calculator to
• calculate a relative phase of an element electric-field vector corresponding to each of the sub-reflector panels based on a change in received electric-field strength of the radio wave received by the primary emitter during driving of the sub-reflector panel drive mechanisms, and
• determine positions of the sub-reflector panels at which a phase distribution on an aperture surface of the main reflector is minimized;
• and
• one or more focusing reflectors between the sub-reflector and the primary emitter,
• wherein the radio wave reflected by the sub-reflector is reflected by the one or more focusing reflectors to focus on a phase center of the primary emitter.