Design of relay station antenna suitable for tunnel

This paper proposes a relay station antenna design method suitable for the tunnel environment. With the increase of underground and underground tunnels, the safety of enclosed spaces has become the focus of attention. With the rapid development of the information network, if the mobile phone loses its signal, people will not feel secure. Therefore, it is very important to ensure the signal stability in the tunnel. To this end, we designed a high-gain antenna with low cost and simple structure based on a planar Yagi antenna and a flat-surface number-period dipole antenna. The omnidirectional receiving and directional transmitting methods are used to distribute the antennas in the tunnel to ensure the complete coverage of the signals in the tunnel.