To provide an antenna device of a configuration to reduce deterioration in antenna performance in the case of using a conductor having a prescribed resistance value for an antenna element.
An antenna device comprises: a planar first antenna element 101; a second antenna element 102; a first feeding terminal 103 positioned in the first antenna element 101; a second feeding terminal 104 positioned in the second antenna element 102. The first antenna element 101 and the second antenna element 102 are conductors having a sheet resistance of 1 Ω/sq. or more, and the maximum value of an element width 105 of the first antenna element 101 and that of an element width 106 of the second antenna element 102 is 1/16 wavelength or more and 1/4 wavelength or less, and the element width 105 of the first antenna element 101 in the first feeding terminal 103 is (1.2)-R/10×0.2 wavelength or less (R: sheet resistance(Ω/sq.)).
UNO HIROYUKI
YAMAZAKI YUKARI
SAITO YUTAKA
Daisuke Nagano
Kentaro Fujii