A dual band antenna system that combines into a single integrated device an H-field
shielded loop antenna and an E-field antenna. The system includes an unshielded
section bounded on each end by first and second shielded sections, respectively.
Input frequency filters are electrically connected to the first shielded section
to selectively pass one of a first radio frequency signal or a second radio frequency
signal through the first shielded section. Output frequency filters electrically
connected to the unshielded section for switching between two paths of transmission
and associated modes of operation: (i) a first mode (operating as an H-field antenna)
in which an H-field transmission pattern is generated in the first and second shielded
sections; and (ii) a second mode (operating as an E-field antenna) wherein an E-field
is radiated via the E-field antenna.
