Patent ID: 8018339

Claim:
An intruder detection system, comprising: a transmission-side leaky transmission line for transmitting a detection signal for detecting an intruder; and a reception-side leaky transmission line for receiving a detection signal leaked from the transmission-side leaky transmission line; the transmission-side leaky transmission line and the reception-side leaky transmission line being buried spaced apart from each other in an intruder surveillance area, and the presence/absence of an intruder being detected based on a variation in the detection signal received by the reception-side leaky transmission line; wherein at least part of one of the transmission-side leaky transmission line or the reception-side leaky transmission line is made of a surface-wave-type leaky coaxial transmission line, and the other one of the transmission-side leaky transmission line or the reception-side leaky transmission line is made of a radiation-type leaky coaxial transmission line.