Patent ID: 8441408

Claim:
A multiple input multiple output (MIMO) antenna comprising: a first antenna element disposed on a first side of a substrate in a round form; a second antenna element in a round form symmetrically with the first antenna element and disposed on the first side of the substrate; and a ground disposed on a second side of the substrate, wherein the first antenna element and the second antenna element are disposed such that electro magnetic waves resonating in the first antenna element and the second antenna element are orthogonally polarized, wherein a whole form of the first antenna element and the second antenna element has a round form respectively, wherein the ground comprises: a first ground and a second ground disposed on the second side of the substrate; a third ground disposed below the first and second grounds; a first connector which directly interconnects the first ground and the third ground; and a second connector which directly interconnects the second ground and the third ground, wherein a part of the first ground faces a part of the first antenna element, and a part of the second ground faces a part of the second antenna element.