Development of dual leaky coaxial cable for intruder detection sensor

We have been developed a dual leaky coaxial cable (DLCX) for an intruder detection sensor based on microwave technologies. The current sensor consists of a sensor unit and two leaky coaxial cables (LCXs) working as transmitting (tx) and receiving (rx) antennas respectively. It can detect an intruder that penetrates a surveillance area formed around the LCXs. It requires that the pair of LCX is laid at a distance of more than 1 m to keep tx-rx isolation. Since all sites do not always have enough space for cables, there exists a market demand of the reduction of the cable installation space. To solve this problem, we developed the DLCX that has enough tx-rx isolation, even if two LCXs are surrounded by the same sheath. In this paper, we evaluate a performance of the sensor configured with the DLCX and the sensor unit. Experiments results are presented to show that the evaluated sensor is indeed feasible for the intruder detection.