Dual resonance antenna for portable telephone

摘要

A portable telephone (10) has an antenna (12) which has attenuated near field transmitted RF signal emissions in the direction (28) of a user and substantially omnidirectional far field RF emissions. The antenna (12) includes a ground plane (38) positioned in the user direction (28) from antenna radiating elements (44). The radiating elements (44) are configured to cause the antenna (12) to resonate at a lower frequency (58) and a higher frequency (62). The radiating elements (44) are further configured so that the lower resonant frequency (58) is below the bandwidth (56) of the antenna (12) and so that the higher resonant frequency (62) is above the bandwidth (56) of the antenna (12).