As an important component of the urban transportation network, the subway nowadays undertakes the responsibility of more and more residents traveling. Subway tunnels are a semi enclosed environment that imposes certain limitations and obstacles on the propagation of electromagnetic signals, affecting the transmission quality of wireless communication. Therefore, leaky cables have been widely used in tunnel mobile communication. However, the electromagnetic waves radiated by them can cause certain losses during the communication process. To address this issue, we propose a low loss communication scheme for leaky cables in subway tunnels. The application of artificial magnetic conductors in reducing the radiation of leaked cables can effectively reduce communication losses.