Patent ID: 8193990

Claim:
A microstrip array antenna comprising: a dielectric substrate formed with a conductive ground plate at a back surface thereof; and strip conductors formed on a front surface of said dielectric substrate; said strip conductors including a linear main feeding strip line, and a plurality of array elements connected to said main feeding strip line, said array elements being disposed at least one of both sides of said main feeding strip line at a predetermined interval along a longitudinal direction of said main feeding strip line, each of said array elements including a sub-feeding strip line connected to said main feeding strip line, a rectangular radiating antenna element connected to a terminal end of said sub-feeding strip line, and a stub connected to said sub-feeding strip line, said stub being disposed between a connecting position between said main feeding strip line and said sub-feeding strip line and a connecting position between said sub-feeding strip line and said radiating antenna element; wherein said array element is formed such that a direction of electrical field radiated from said stub and a direction of electrical field radiated from said radiating antenna element are the same with each other.