A monopole antenna structure disclosed herein includes a ceramic block with a metallic surface coupled to a feed structure and a planar radiation element electrically floating relative to the ceramic block. The planar radiation element is in a parallel plane alignment with the metallic surface of the ceramic block. When the feed structure provides signal of one or more select frequencies to the metallic surface of the ceramic block, the ceramic block radiates (e.g., transmits a carrier wave) and in turn, excites the planar radiation element to re-radiate the signal.