Patent ID: 8421694

Claim:
A composite antenna device for responding to waves in a plurality of radio frequency bands, comprising: a sheet of conductor plate; a first antenna provided on the sheet of conductor plate for responding to a linearly-polarized wave in at least one radio frequency band; and a second antenna provided on the sheet of conductor plate for responding to a circularly-polarized wave in a radio frequency band that is different from the at least one radio frequency band, wherein: the first antenna comprises a ground portion, the second antenna is formed in an area in the ground portion, each of the first antenna and the second antenna comprises a feeding point, and the second antenna comprises the feeding point and a two-dimensional barcode-like conductor line pattern, the conductor line pattern being obtained by vertically and horizontally dividing a rectangular conductor region into a predetermined number or less of equal segments, and by removing some of the segments to allow the remaining segments to make up the conductor line pattern.