CPC H04B 17/21 (2015.01) [H01Q 1/246 (2013.01); H01Q 21/0006 (2013.01)] | 15 Claims |
1. An antenna, comprising:
at least three radio frequency interfaces, wherein each radio frequency interface of the at least three radio frequency interfaces is connected to a radio frequency channel between the respective radio frequency interface and a remote radio unit (RRU); and
a feed network, comprising a main feed circuit, a calibration signal circuit, and a switch;
wherein a first radio frequency interface of the at least three radio frequency interfaces is configured to receive a first signal from the RRU, and transmit the first signal to a second radio frequency interface of the at least three radio frequency interfaces using the feed network;
wherein the second radio frequency interface is configured to send the first signal to the RRU;
wherein the calibration signal circuit is configured to transmit a calibration signal from the first radio frequency interface to the second radio frequency interface, wherein the calibration signal is used to calibrate a phase and an amplitude of a radio frequency channel connected to the first radio frequency interface; and
wherein the switch is configured to isolate the calibration signal from the first signal on the main feed circuit.
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