Methods and systems for implementing and operating antennas, particularly multiple-input and multiple-output (MIMO) antennas. An example antenna may include a planar dielectric substrate, a primary conductive area on a first surface of the planar dielectric substrate, a first secondary conductive area on the first surface, and a second secondary conductive area. The primary conductive area has a shape that defines at least a first region and a second region of the first surface, with the first region bounded by at least a portion of the primary conductive area, and the second region including a remaining portion of the first surface. The first secondary conductive area may lie in the first region of the first surface, and the second secondary conductive area may lie in the second region.