Dual-polarized antenna

A method for producing a dual-polarized antenna, the method comprising:

• providing a first dielectric substrate having a first main surface and a second main surface opposite the first main surface;
• patterning a conductive film provided on the first main surface of the first dielectric substrate so as to form a first ground conductor having an opening on the first main surface of the first dielectric substrate;
• providing a second dielectric substrate having a first main surface and a second main surface opposite the first main surface;
• patterning a conductive film provided on the first main surface of the second dielectric substrate so as to form, on the first main surface of the second dielectric substrate, (i) a first metal patch as a radiation element and (ii) a first feed probe, the metal patch being aligned to the opening in a lamination direction, and the first feed probe being configured to excite the first metal patch;
• patterning a conductive film provided on the second main surface of the second dielectric substrate so as to form a second ground conductor on the second main surface of the second dielectric substrate;
• forming a slot in the second ground conductor by etching the conductive film provided on the second main surface of the second dielectric substrate such that (i) a longitudinal direction of the slot is generally parallel to a longitudinal direction of the first feed probe and (ii) more than half of the slot along the longitudinal direction overlaps with the first feed probe along the lamination direction;
• providing a third dielectric substrate having a first main surface and a second main surface opposite to the first main surface;
• patterning a conductive film provided on the second main surface of the third dielectric substrate so as to form, on the second main surface of the third dielectric substrate, (i) a second metal patch as a radiation element and (ii) a second feed probe, the second feed probe being configured to excite the second metal patch;
• and
• laminating the first dielectric substrate, the second dielectric substrate, and the third dielectric substrate such that the second main surface of the first dielectric substrate faces to the first main surface of the second dielectric substrate along the lamination direction and such that the second main surface of the second dielectric substrate faces to the first main surface of the third dielectric substrate along the lamination direction, whereby the slot is positioned between the first and second metal patches in the lamination direction.