Patent ID: 8174455

Claim:
An antenna element comprising: a substrate made of dielectric material and having a first face; a first antenna element made of conductive material and provided on the first face, and configured to receive a circularly polarized wave in a radiation direction; a first power feeding portion made of conductive material and disposed on the first antenna element at a position displaced from a center of the first antenna element; a second antenna element made of conductive material, provided on the first face, and forming a loop surrounding the first antenna element with a gap between the first antenna element and the second antenna element; a second power feeding portion made of conductive material, the second power feeding portion extended from a second antenna element toward the first antenna element and arranged along an edge of the first antenna element so as to form an electromagnetic coupling with the first antenna element to feed power to the second antenna element; and a perturbation element made of conductive material and extended from the second antenna element so that the second antenna element receives a circularly polarized wave in the radiation direction, wherein a length of the loop is twice a circumference length of the first antenna element, and wherein a radiation pattern of the antenna element is composed of a radiation pattern of the first antenna element and a radiation pattern of the second antenna element such that a main beam of the antenna element can be tilted at an angle less than 90 degrees with respect to a line that is perpendicular to the first face.