Circular polarization antenna device and correction control amount determining method

A correction control amount determining method with a circular polarization antenna device including a plurality of antennas arranged, each of the antennas comprising:

• an antenna element which is an emission element capable of emitting or receiving a radio wave each having two orthogonal polarization characteristics, the antenna element including a first feeding terminal and a second feeding terminal, both of which are disposed in such a manner that a main polarization component of a radio wave transmitted or received via the first feeding terminal is orthogonal to a main polarization component of a radio wave transmitted or received via the second feeding terminal;
• a first amplitude adjusting circuit to adjust an amplitude of the high-frequency signal transmitted and received via the first feeding terminal;
• a second amplitude adjusting circuit to adjust an amplitude of the high-frequency signal transmitted and received via the second feeding terminal;
• a first phase shifter to adjust a phase of the high-frequency signal input to and output from the first amplitude adjusting circuit;
• a second phase shifter to adjust a phase of the high-frequency signal input to and output from the second amplitude adjusting circuit;
• and
• a first distribution and combination circuit to distribute the high-frequency signals to the first phase shifter and the second phase shifter, and to combine the high-frequency signals from the first phase shifter and the second phase shifter, the method comprising:
• distributing, by a second distribution and combination circuit, a high-frequency signal to the first distribution and combination circuit included in each of the plurality of antennas, and combining, by the second distribution and combination circuit, a high-frequency signal from the first distribution and combination circuit included in each of the plurality of antennas;
• calculating an amplitude control amount and a phase control amount necessary for beam formation using coordinate information of the antenna element included in each of the plurality of antennas;
• calculating a correction control amount for axial ratio correction on a basis of coordinate information of the antenna element, a function representing a shape of an emission pattern of the high-frequency signal emitted from the antenna element via each of the first feeding terminal and the second feeding terminal, and a coupling amount between the first feeding terminal and the second feeding terminal;
• controlling amplitude adjustment performed by the first amplitude adjusting circuit and the second amplitude adjusting circuit on a basis of the correction control amount;
• and
• controlling phase adjustment performed by the first phase shifter and the second phase shifter on a basis of the correction control amount.