Antenna system for a portable communication device

An antenna system for a portable wireless communication device, comprising:

• a first antenna;
• a second antenna,
• the first and second antennas being proximally located causing electromagnetic coupling therebetween;
• a first RF transceiver;
• a second RF transceiver;
• an isolator coupled with said first and second antennas and said first and second RF transceivers at respective interface ports, said isolator comprising:
• a radio frequency (RF) coupler featuring four RF coupler ports forming two pairs of RF coupler ports, each pair residing at opposite ends of the RF coupler;
• a pair of coupled RF transmission lines connected between each pair of RF coupler ports;
• the first RF transceiver being connected to a first end of a first coupled RF transmission line at a first RF coupler port of the first pair of RF ports;
• the first antenna being connected to a second end of the first coupled RF transmission line at a first RF coupler port of the second pair of RF ports;
• the second RF transceiver being connected to a second end of the second coupled RF transmission line at a second RF coupler port of the second pair of RF ports;
• the second antenna being connected to a first end of the second coupled RF transmission line at a second RF coupler port of the first pair of RF ports;
• said four RF coupler ports being coupled to respective phasor-shaping networks at each of the four RF coupler ports;
• both the first and second antennas receiving RF signals from each one of the first and second RF transceivers;
• both the first and second RF transceivers receiving RF signals from each one of the first and second antennas;
• and
• wherein the first and second RF transceivers operate independently in respective frequency bands.