Patent ID: 7034763

Claim:
A slot antenna comprising: a substrate ( 10 ) having a metal ground plate ( 20 ) on one side thereof and a plurality of rectangular slots ( 40 ) etched in an inner periphery of the ground plate ( 20 ), an opening ( 21 ) defined in one side of the ground plate ( 20 ) and a metal feedline ( 30 ) located on the substrate ( 10 ) and located close to the opening ( 21 ), the feedline ( 30 ) including a plurality of sub-sections extending within the slots ( 40 ), at least two matching stubs ( 31 , 32 , 33 ) formed on the feedline ( 30 ) and a sub-ground plate ( 22 ) connected to the ground plate ( 20 ) and located in the slot ( 40 ), a plurality of metal floating stubs ( 50 , 51 , 52 , 53 ) attached to a rear side of the substrate ( 10 ), the projection of the floating stubs ( 50 , 51 , 52 and 53 ) connected across the ground plate and at least one of the matching stubs ( 31 , 32 , 33 ) of the feedline ( 30 ) when viewing from a front side of the substrate ( 10 ).