Abstract: An emergency braking extension device includes an emergency braking extension loop, a first emergency braking extension train line and a second emergency braking extension train line. The emergency braking extension loop has a protective circuit breaker, a normally open contact of an emergency braking button, and an emergency braking extension relay, which are sequentially connected in series. A normally open contact of the emergency braking extension relay is connected in series to a pantograph lowering control loop. A first normally closed contact and a second normally closed contact of the emergency braking extension relay are connected in series to a return line and a power supply negative loop of a train emergency braking control loop, respectively. A third normally closed contact of the emergency braking extension relay is connected in series to a control loop of a bypass cut-off circuit of a train emergency braking execution loop.

Abstract: An emergency braking extension device includes an emergency braking extension loop, a first emergency braking extension train line and a second emergency braking extension train line. The emergency braking extension loop has a protective circuit breaker, a normally open contact of an emergency braking button, and an emergency braking extension relay, which are sequentially connected in series. A normally open contact of the emergency braking extension relay is connected in series to a pantograph lowering control loop. A first normally closed contact and a second normally closed contact of the emergency braking extension relay are connected in series to a return line and a power supply negative loop of a train emergency braking control loop, respectively. A third normally closed contact of the emergency braking extension relay is connected in series to a control loop of a bypass cut-off circuit of a train emergency braking execution loop.

Abstract: The invention discloses a broadband dual-polarization filtering base station antenna unit, a base station antenna array and a communication device, the antenna unit comprising four dipole arms, four parasitic branches and a feed structure, wherein two of the dipole arms are arranged oppositely, the other two dipoles are also arranged oppositely, the four dipole arms correspond to the four parasitic branches respectively, each dipole arm is coupled to a corresponding parasitic branch, the feed structure is connected with the four dipole arms; the antenna array comprising at least two antenna units described above; the communication device comprising the antenna unit described above, or comprising the antenna array described above.