Patent ID: 8860613

Claim:
A patch antenna comprising: a substrate; a ground electrode placed on the substrate; a first patch configured to be electrically conductive and placed above the ground electrode, the first patch being formed in a ring-like shape and having an outer diameter corresponding to a first frequency to transmit a signal of the first frequency into air or receive therefrom; a second patch configured to be electrically conductive and placed above the first patch, the second patch being formed in a ring-like shape and having an outer diameter corresponding to a second frequency to transmit a signal of the second frequency into air or receive therefrom, the second frequency being higher than the first frequency; a dielectric member configured to be placed on the ground electrode and support the first patch and the second patch so as that the ground electrode, the first patch, and the second patch are arranged in parallel to each other; a first conductor configured to be formed in a cylindrical shape, the first conductor being connected to an inner edge of the first patch at one end and to the ground electrode at the other end; a second conductor configured to be formed in a cylindrical shape and arranged so as to pass through inside the first conductor, the second conductor being connected to an inner edge of the second patch at one end and to the ground electrode at the other end; a first feed line connected to the first patch at a first feed point positioned outside the inner edge of the first patch, at least part of the first feed line being a coaxial line; and a second feed line configured to pass through between the first conductor and the second conductor and be connected to the second patch at a second feed point positioned outside the inner edge of the second patch, at least part of the second feed line being a coaxial line.