Patent ID: 7365685

Claim:
An antenna device comprising: a first dielectric substrate having a patch conductor disposed thereon, the patch conductor having a vertical width of L 1 and a horizontal width of L 1 ; and a second dielectric substrate confronting the first dielectric substrate and having a grounding conductor disposed on a substrate surface confronting the patch conductor; wherein the second dielectric substrate is disposed on a spacer disposed on the first dielectric substrate and the second dielectric substrate and the first dielectric substrate are separated from each other by a distance by the spacer to form a space interposed between the second dielectric substrate and the first dielectric substrate; wherein a dielectric substance that is not air or air is interposed in the space between the first dielectric substrate and the second dielectric substrate when a radio wave to be used for communication has a frequency of from 2.10 to 2.65 GHz; wherein when the dielectric substance that is not air is interposed in the space between the first dielectric substrate and the second dielectric substrate, the dielectric substance has a dielectric constant of from 1.89 to 5.20 and L 1 is from 21.3 to 36.11 mm; and wherein when air is interposed between the first dielectric substrate and the second dielectric substrate, L 1 is from 32.68 to 41.80 mm.