Antenna apparatus

An antenna apparatus comprising:

• a finite ground plane;
• a plate-like conductive element configured to include
• a first conductive plate disposed so as to oppose the finite ground plane, and
• a second conductive plate that shorts a first edge of the first conductive plate to the finite ground plane;
• and
• an antenna configured to include
• an antenna element, and
• a feeding point feeding power to the antenna element, which is positioned in the vicinity of a second edge in a side opposite to the first edge of the first conductive plate,
• wherein
• the plate-like conductive element
• propagates an electromagnetic wave which is radiated from the antenna and incorporated into a space between the first conductive plate and the finite ground plane from the second edge side of the first conductive plate, by means of reflection between the first conductive plate and the finite ground plane toward an inside surface of the second conductive plate to reflect the electromagnetic wave on the inside surface, and
• propagates a reflected electromagnetic wave by means of reflection between the first conductive plate and the finite ground plane toward the second edge side of the first conductive plate to output the electromagnetic wave outside the space so that a desired phase delay is induced in the electromagnetic wave,
• the first conductive plate includes
• a first conductive element in a thin plate-like manner, and
• a plurality of second conductive elements in a thin plate-like manner perpendicular to the first conductive element, one edge of each second conductive element being connected to the first conductive element at different positions respectively, and
• the second conductive plate includes a plurality of third conductive elements in a thin plate-like manner which shorts the other edge of the second conductive elements to the finite ground plane.