Active antenna unit and communication device

A communication device, comprising:

• a baseband unit, and
• an active antenna unit comprising N radio frequency antenna links and L self-interference cancellers, wherein N is an integer greater than 1, and L is a positive integer less than or equal to N;
• each of the N radio frequency antenna links comprises a transmit channel, a receive channel, a feed network connected to the transmit channel and the receive channel, and an antenna subarray connected to the feed network, the feed network is configured to feed power to the antenna subarray, and the antenna subarray is configured to:
• transmit a signal and receive a signal;
• and a self-interference canceller is connected between a transmit channel and a receive channel of at least one of the N radio frequency antenna links, and the self-interference canceller is configured to cancel a signal that is on the receive channel of the radio frequency antenna link of the self-interference canceller and that is from the transmit channel of the same radio frequency antenna link;
• and
• the N radio frequency antenna links meet at least one of the following:
• traces of feed networks of at least two of the N radio frequency antenna links are different;
• or
• an isolation assembly is disposed between N antenna subarrays of the N radio frequency antenna links, and the isolation assembly is configured to isolate a signal between the N antenna subarrays.