Antenna device

An antenna device, comprising:

• a dielectric substrate;
• at least one first electric supply line that comprises a microstrip line and is formed on the dielectric substrate;
• at least one antenna element that comprises a microstrip line and is formed on the dielectric substrate, the antenna element including half a wavelength in electrical length along a longitudinal direction and being formed in parallel to and on either side of the at least one first electric supply line;
• at least one second electric supply line for connecting the at least one first electric supply line with the antenna element;
• and
• a reflector plate disposed at a predetermined angle of inclination to the dielectric substrate,
• wherein the at least one first electric supply line and the antenna element deviate from a dimensional factor that allows the at least one first electric supply line and the antenna element to have an omnidirectivity, and the at least one first electric supply line and the antenna element have a dimensional factor that allows the at least one first electric supply line and the antenna element to have an elliptical directivity, wherein one of the dimensional factors includes a distance between two adjacent ones of the at least one second electric supply line positioned on the at least one first electric supply line along the longitudinal direction of the dielectric substrate.