A multi-band antenna includes a planar conductive layer that comprises a conductive region and a non-conductive region. The conductive region and the non-conductive region together define a first slot-strip structure, a second slot-strip structure coupled to the first slot-strip structure, and a third slot-strip structure coupled to the second slot-strip structure. The first slot-strip structure includes a signal feed portion. The second slot-strip structure includes a first signal grounding portion. The third slot-strip structure includes a second signal grounding portion.