Patent ID: 8081116

Claim:
An antenna element comprising: a folded plate-shaped monopole antenna portion having a U-shape in cross section; and an extending portion extending from said folded plate-shaped monopole antenna portion; wherein said folded plate-shaped monopole antenna comprises: a first conductive plate having a first length; a second conductive plate which is disposed in parallel with said first conductive plate and which has a second length shorter than the first length; and a coupling plate for coupling said first conductive plate with said second conductive plate at a first end portion thereof, wherein said extending portion extends from any one of said first conductive plate, said second conductive plate, and said coupling plate, wherein said folded plate-shaped monopole antenna portion has first and second side edges opposite to each other, and wherein said extending portion comprises: a first extending portion which extends from the second side edge of a tip portion of said second conductive plate in an extending direction where said second conductive plate extends in a longitudinal direction of said second conductive plate; a second extending portion which is bent from a tip of said first extending portion in a direction at right angles to said first extending portion toward the first end portion on the extending surface where said second conductive plate extends; and a third extending portion which is bent from a tip of said second extending portion in a direction at right angles to said second extending portion and which extends nearer to said coupling plate on an extending surface where said coupling plate extends.