A multi-band, dual-antenna and antenna interface module system for mobile phones

This paper presents details of a self-diplexing dual antenna system and associated antenna interface module. The manufactured demonstrator operates efficiently in 4 GSM bands and 3 UTRA bands with antennas that are just are 6mm high. It is shown that the VSWR can be maintained below approximately 4:1 in all modes no matter how the phone containing the antennas is held.