Method for detecting connection relationship in radio frequency channel in base station antenna and calibrating channel

A calibration network, used in a base station antenna, wherein the calibration network comprises:

• n−1 phase shift branches, respectively performing phase shift processing on coupled signals from n−1 radio frequency channels in n radio frequency channels, to obtain n−1 signals comprising phase identifiers, wherein n≥2, and the phase identifier is used to uniquely mark an antenna port connected to an RRU port on a radio frequency channel to which a respective signal belongs;
• and
• a divider/combiner, comprising a combiner end and n input ends, wherein the n input ends are configured to correspondingly receive coupled signals of the n radio frequency channels, n−1 input ends in the n input ends are configured to correspondingly receive the coupled signals of the n−1 radio frequency channels, the n−1 phase shift branches are correspondingly connected to the n−1 input ends, a reference branch of the n−1 phase shift branches is connected to a reference input end, and the reference input end is an input end other than the n−1 input ends in the n input ends;
• and the combiner end is configured to combine the n−1 signals comprising the phase identifiers and a coupled signal received by the reference input end into one channel for output.