A capacitively-loaded loop antenna and corresponding radiation method have
been provided. The antenna comprises a transformer loop having a balanced
feed interface and a capacitively-loaded loop radiator. In one aspect,
the capacitively-loaded loop radiator is a balanced radiator. In another,
the transformed loop and capacitively-loaded loop radiator are physically
connected. That is, the transformer loop and the capacitively-loaded loop
radiator have a portion shared by both of the loop perimeters.
Alternately, the loops are physically independent of each other. In one
aspect, the perimeters have a rectangular shape. Other shapes such as
round or oval are also possible. In another aspect, the planes formed by
the transformer and capacitively-loaded loop radiator can be coplanar or
non-planar, while both loops are orthogonal to a common magnetic
near-field generated by the transformed loop. The radiator has a
capacitively-loaded side, or capacitively loaded perimeter section,
depending on the shape of the perimeter.