Duplexed phased array antennas
Multi-band antennas include one or more duplexers configured to provide isolation of non-linearities generated along a downlink path of RF signals transmitted from the multi-band antenna from an uplink path of RF signals received by the multi-band antenna.
1. A base station antenna, comprising:
a first radio frequency (“RF”) input that is configured to receive signals in a first frequency band;
a first splitter that has an input coupled to the first RF input and a plurality of outputs;
a plurality of first transmit path adjustable phase shifters that are coupled to the respective outputs of the first splitter;
a plurality of first sub-arrays of radiating elements, each first sub-array including at least one radiating element;
a plurality of first receive path adjustable phase shifters;
a first combiner that has a plurality of inputs that are coupled to the respective first receive path adjustable phase shifters and an output that is coupled to the first RF input; and
a plurality of first duplexers, where each first duplexer includes a transmit port that is coupled to a respective one of the first transmit path adjustable phase shifters, a receive port that is coupled to a respective one of the first receive path adjustable phase shifters, and a common port that is coupled to a respective one of the first sub-arrays of radiating elements.
2. The base station antenna of claim 1 , further comprising:
a second RF input that is configured to receive signals in a second RF frequency band that is different from the first RF frequency band;
a second splitter that has an input coupled to the second RF input and a plurality of outputs;
a plurality of second transmit path phase shifters that are coupled to the respective outputs of the second splitter;
a plurality of second sub-arrays of radiating elements, each second sub-array including at least one radiating element;
a plurality of second receive path phase shifters;
a second combiner that has a plurality of inputs that are coupled to the respective second receive path phase shifters and an output that is coupled to the second RF input; and
a plurality of third duplexers, where each third duplexer includes a transmit port that is coupled to a respective one of the second transmit path phase shifters, a receive port that is coupled to a respective one of the second receive path phase shifters, and a common port that is coupled to a respective one of the second sub-arrays of radiating elements.
3. The base station antenna of claim 2 , further comprising a fourth duplexer that has a common port that is coupled to the second RF input, a transmit path port that is coupled to the input of the second splitter, and a receive path port that is coupled to the output of the second combiner.
4. The base station antenna of claim 3 , further comprising a second low noise amplifier between the second combiner and the fourth duplexer.
5. The base station antenna of claim 1 , further comprising
a second RF input that is configured to receive signals in a second RF frequency band that is different from the first RF frequency band;
a second splitter that has an input coupled to the second RF input and a plurality of outputs;
a plurality of second transmit path phase shifters that are coupled to the respective outputs of the second splitter;
a plurality of second receive path phase shifters;
a second combiner that has a plurality of inputs that are coupled to the respective second receive path phase shifters and an output that is coupled to the second input; and
wherein the first duplexers comprise multi-band duplexers, and wherein each first duplexer further includes a second transmit port that is coupled to a respective on of the second transmit phase path shifters and a second receive port that is coupled to a respective one of the second receive path phase shifters.
6. The base station antenna of claim 5 , further comprising a fourth duplexer that has a common port that is coupled to the second RF input, a transmit path port that is coupled to the input of the second splitter, and a receive path port that is coupled to the output of the second combiner.
7. The base station antenna of claim 6 , further comprising a second low noise amplifier between the second combiner and the fourth duplexer.
8. The base station antenna of claim 1 , wherein the first splitter and the plurality of first transmit path adjustable phase shifters are implemented as a first transmit path adjustable phase shifter circuit, and the first combiner and the plurality of first receive path adjustable phase shifters are implemented as a first receive path adjustable phase shifter circuit.
9. The base station antenna of claim 1 , wherein the first transmit path adjustable phase shifters comprise micro electro-mechanical or piezoelectric phase shifters.
10. A base station antenna, comprising:
a first radio frequency (“RF”) input that is configured to receive signals in a first frequency band;
a first splitter that has an input coupled to the first RF input and a plurality of outputs;
a plurality of first transmit path phase shifters that are coupled to the respective outputs of the first splitter;
a plurality of first sub-arrays of radiating elements, each first sub-array including at least one radiating element;
a plurality of first receive path phase shifters;
a first combiner that has a plurality of inputs that are coupled to the respective first receive path phase shifters and an output that is coupled to the first RF input;
a plurality of first duplexers, where each first duplexer includes a transmit port that is coupled to a respective one of the first transmit path phase shifters, a receive port that is coupled to a respective one of the first receive path phase shifters, and a common port that is coupled to a respective one of the first sub-arrays of radiating elements; and
a second duplexer that has a common port that is coupled to the first RF input, a transmit path port that is coupled to the input of the first splitter, and a receive path port that is coupled to the output of the first combiner.
11. The base station antenna of claim 10 , further comprising a low noise amplifier between the first combiner and the second duplexer.
12. An antenna comprising:
a first duplexer coupled to a first input of the antenna;
at least one first phase shifter and at least one second phase shifter, each of the at least one first phase shifter and the at least one second phase shifters being coupled to the first duplexer;
at least one second duplexer coupled to the at least one first phase shifter and one or more radiating elements of the antenna.
13. The antenna of claim 12 , further comprising:
a first splitter that is coupled between the first duplexer and the at least one first phase shifter; and
a first combiner that is coupled between the first duplexer and the at least one second phase shifter.
14. The antenna of claim 13 , wherein the radiating elements comprise a plurality of first radiating elements that are arranged as a plurality of first sub-arrays of radiating elements, each first sub-array of radiating elements including at least one first radiating element.
15. The antenna of claim 14 , wherein the at least one second duplexer comprises a plurality of second duplexers, wherein each second duplexer is coupled to a respective one of the first sub-arrays of radiating elements.
16. The antenna of claim 15 , wherein the at least one first phase shifter comprises a plurality of first phase shifters that are coupled to respective outputs of the first splitter, and wherein the at least one second phase shifter comprises a plurality of second phase shifters that are coupled to respective inputs of the first combiner.
17. The antenna of claim 16 , further comprising:
a third duplexer coupled to a second input of the antenna;
a plurality of third phase shifters;
a plurality of fourth phase shifters;
a plurality of second radiating elements that are arranged as a plurality of second sub-arrays of radiating elements, each second sub-array of radiating elements including at least one second radiating element;
a second splitter that is coupled between the third duplexer and the respective third phase shifters;
a second combiner that is coupled between the third duplexer and the respective fourth phase shifters; and
a plurality of fourth duplexers, wherein each fourth duplexer is coupled between a respective one of the third phase shifters and a respective one of the second sub-arrays of radiating elements.
18. The antenna of claim 13 , further comprising a low noise amplifier between the first combiner and the first duplexer.
19. An antenna comprising:
a first duplexer having a transmit path port, a receive path port and a combined port that is coupled to a first input of the antenna;
at least one first phase shifter that is coupled to the transmit port of the first duplexer;
at least one second phase shifter that is coupled to the receive port of the first duplexer;
a plurality of sub-arrays of radiating elements that each include at least one radiating element;
a plurality of second duplexers that are coupled between the at least one first phase shifter and respective ones of the sub-arrays of radiating elements.
20. The antenna of claim 19 , wherein the plurality of second duplexers are also coupled between the at least one second phase shifter and respective ones of the sub-arrays of radiating elements.