Array antenna apparatus including multiple steerable antennas and capable of eliminating influence of surrounding metal components

An array antenna apparatus comprising:

• a plurality of steerable antennas, each having one active antenna element and at least one parasitic antenna element;
• and
• at least one metal block with a length longer than a longitudinal length of each of the active antenna elements,
• wherein at least two of the steerable antennas are simultaneously excited,
• wherein each of the active antenna elements is associated with at least one of the at least one metal block such that the at least one metal block associated with a corresponding active antenna element is disposed remote from the corresponding active antenna element by a predetermined distance and operates as a reflector for the corresponding active antenna element, and
• wherein each of the parasitic antenna elements is provided with a switching circuit for changing an electrical length of the parasitic antenna element, and the parasitic antenna element operates as a reflector for an active antenna element of the same steerable antenna as the parasitic antenna element by changing the electrical length using the switching circuit.