Bi-band antenna incorporating primary and secondary windings where the sensitivity characteristics utilising a plurality of bands of frequencies is improved and the antenna may be miniaturised

摘要

An antenna (300) comprises: (a) a primary spiral winding (100) having a certain step; (b) a secondary spiral winding (200) connected to one end of the primary winding, arranged at the exterior of the primary winding and having a greater step than the primary winding; (c) where one band of frequencies is provided on the whole of the primary and secondary windings and another band of frequencies is provided on the secondary winding. An independent claim is also included for a method for the fabrication of such an antenna.