Surface-mountable dual side-feed circularly polarized ceramic chip antenna

A novel surface-mountable dual side-feed circularly polarized ceramic chip antenna on a system circuit board is presented. The antenna mainly comprises a square radiating patch, a square ground plane, and two vertical conformal strips for the dual side-feed, which are printed on the top, bottom and side surfaces of a ceramic chip. For obtaining circular polarization (CP) radiation for global positioning system (GPS) operation at 1575 MHz, a prototype using a square-disk ceramic chip of dimensions 4/spl times/17.5/spl times/17.5 mm/sup 3/ and relative permittivity 45 was studied, and the experimental results are presented.