A dual-band antenna includes a planar conductive layer comprising a conductive region and a central non-conductive region. The conductive region and the non-conductive region together define a pair of interconnected F-slot structures, and a loop strip structure coupled to and disposed around the F-slot...http://www.google.de/patents/US7773040?utm_source=gb-gplus-sharePatent US7773040 - Dual-band F-slot patch antenna
