Mimo antenna device

A MIMO antenna device that performs spatial multiplex transmission, the MIMO antenna device comprising:

• a front-side dipole antenna disposed on a front-side surface;
• and
• a back-side dipole antenna which is an antenna for the same frequency band as the front-side dipole antenna and which is disposed on a back-side surface opposite to the front-side surface,
• the front-side dipole antenna including:
• a front-side feed point;
• a long-side feed part for front-side hot element connected at its long side to the front-side feed point;
• a front-side hot element extending from the long-side feed part for front-side hot element;
• a long-side feed part for front-side ground element connected at its long side to the front-side feed point, the long side facing in parallel the long side of the long-side feed part for front-side hot element with a predetermined interval;
• and
• a front-side ground element extending from the long-side feed part for front-side ground element and disposed point-symmetric to the front-side hot element with respect to the front-side feed point in an offset manner,
• the back-side dipole antenna including:
• a back-side feed point;
• a long-side feed part for back-side hot element connected at its long side to the back-side feed point;
• a back-side hot element extending from the long-side feed part for back-side hot element;
• a long-side feed part for back-side ground element connected at its long side to the back-side feed point, the long side facing in parallel the long side of the long-side feed part for back-side hot element with a predetermined interval;
• and
• a back-side ground element extending from the long-side feed part for back-side ground element and disposed point-symmetric to the back-side hot element with respect to the back-side feed point in an offset manner,
• wherein the front-side dipole antenna and the back-side dipole antenna are arranged such that the front-side feed point and the back-side feed point substantially overlap each other in a top view and that the long-side feed part for front-side hot element and the long-side feed part for front-side ground element are arranged perpendicular to the long-side feed part for back-side hot element and the long-side feed part for back-side ground element.