US 11,784,728 B2
Radio frequency channel calibration method and apparatus, antenna, and base station
Weihong Xiao, Dongguan (CN); Linlin Wang, Xi'an (CN); Lanping Gong, Dongguan (CN); and Lei Chen, Xi'an (CN)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed on Jul. 29, 2021, as Appl. No. 17/388,872.
Application 17/388,872 is a continuation of application No. PCT/CN2020/072465, filed on Jan. 16, 2020.
Claims priority of application No. 201910094297.5 (CN), filed on Jan. 30, 2019.
Prior Publication US 2021/0391929 A1, Dec. 16, 2021
Int. Cl. H04B 17/21 (2015.01); H01Q 1/24 (2006.01); H01Q 21/00 (2006.01)
CPC H04B 17/21 (2015.01) [H01Q 1/246 (2013.01); H01Q 21/0006 (2013.01)] 15 Claims
OG exemplary drawing
 
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.