Abstract: An antenna includes a conductive patch. The patch includes, in a plan view, a first power feed-side edge and a first non-power feed-side edge positioned on opposite sides in a first direction in one-to-one relation, and a second power feed-side edge and a second non-power feed-side edge positioned on opposite sides in a second direction intersecting the first direction in one-to-one relation. The patch includes, in the plan view, a first power feed point positioned on a side nearer to the first power feed-side edge and a second power feed point positioned on a side nearer to the second power feed-side edge. In the plan view, at least a portion of the first power feed-side edge expands outward and forms a protrusion. A width of the protrusion in the second direction gradually decreases toward a top of the protrusion. The first power feed point is positioned nearer to the top of the protrusion than a middle of a hill slope of the protrusion in the first direction.

Abstract: A circular polarized array antenna includes an antenna layer and a ground layer. The antenna layer includes a plurality of antenna elements disposed at different positions in plan view. Each of the antenna elements is composed of a circular polarized antenna. The ground layer faces the antenna layer. The ground layer includes a plurality of ground patterns separated from each other. Each of the ground patterns faces one or more of the antenna elements.

Abstract: A machine tool assembling apparatus and a method of assembling a machine tool using the machine tool assembling apparatus are provided. The machine tool assembling apparatus includes a table, a first support mechanism having an arm which is swingable toward and away from the table, and a second support mechanism. The first support mechanism is disposed between the table and the second support mechanism. The first support mechanism is rotated to bring the arm into facing relation to either the table or the second support mechanism.

Abstract: A machine tool assembling apparatus and a method of assembling a machine tool using the machine tool assembling apparatus are provided. The machine tool assembling apparatus includes a table, a first support mechanism having an arm which is swingable toward and away from the table, and a second support mechanism. The first support mechanism is disposed between the table and the second support mechanism. The first support mechanism is rotated to bring the arm into facing relation to either the table or the second support mechanism.