Patent ID: 8018392

Claim:
An antenna element comprising: a radio transceiver that transmits and receives a radio wave; a signal input pad; a ground layer; a connection portion for electrically connecting the radio transceiver to the ground layer and the signal input pad, wherein the connection portion is directly connected to the signal input pad; a silicon substrate on which the connection portion, the radio transceiver, the signal input pad, and the ground layer are formed; and a SiO 2 insulating film formed on a first surface and a second surface of the silicon substrate and formed to interpose between the connection portion and the silicon substrate, wherein the SiO 2 insulating film is for electrically insulating the silicon substrate from the connection portion, the radio transceiver, the signal input pad, and the ground layer; a solder resist formed around the radio transceiver, the signal input pad, and the ground layer, wherein the radio transceiver is disposed on the first surface of the silicon substrate with the SiO 2 insulating film interposed therebetween, and wherein the ground layer and the signal input pad are disposed on the second surface of the silicon substrate opposite to the first surface thereof with the SiO 2 insulating film interposed therebetween, and wherein the signal input pad and the ground layer are on a same plane, and wherein the connection portion is disposed to penetrate the silicon substrate with the SiO 2 insulating film interposed between the connection portion and the silicon substrate.