Patent ID: 7623086

Claim:
Portable radio frequency (RF) transmitter means ( 500 , 600 ) for use in a wireless communications system to transmit RF signals at a frequency for which maximum transmitted radiation level is restricted by regulation, the portable radio frequency (RF) transmitter means ( 500 , 600 ) having an antenna means ( 203 ) for radiating RF energy at said frequency and an absorber means ( 501 , 601 , 602 ) for reducing radiation efficiency of the antenna means ( 203 ) in all directions when in isolation such that, when the transmitter means is being carried and used by an operator, the relative effect upon the output radiation of the antenna means ( 203 ) attributable to the presence of the operator is reduced, wherein the absorber means covers a surface area of at least one side of the ground plane but leaves uncovered a portion of the ground plane adjacent an antenna ( 203 ) of the transmitter means.