CPC H04B 1/525 (2013.01) [H01Q 1/243 (2013.01); H04B 1/0458 (2013.01); H04B 1/48 (2013.01)] | 16 Claims |
8. A portable communications device comprising:
a housing;
a radio-frequency (RF) antenna system including a first RF antenna, a second RF antenna, and a third RF antenna supported by the housing;
an RF transceiver system including a first RF transceiver, a second RF transceiver, and a third RF transceiver operating in respective RF bands; and
an isolator circuit coupled to the RF antenna system and the RF transceiver system and configured to provide RF isolation between the first RF transceiver, the second RF transceiver, and the third RF transceiver, the isolator circuit including
a first RF coupler realized using coupled RF transmission lines and featuring six RF coupler ports coupled to the first RF antenna, the second RF antenna, the third RF antenna, the first RF transceiver, the second RF transceiver, and the third RF transceiver through respective phasor shaping networks;
a second RF coupler coupled between (i) the first RF coupler and (ii) the first RF antenna and at least one selected from the group consisting of: the second RF transceiver and the third RF transceiver; and
a third RF coupler coupled between (i) the first RF coupler and (ii) the first RF transceiver and at least one selected from the group consisting of: the second RF antenna and the third RF antenna.
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