The Study On The Perimeter Security Installation Using The Coupled Electromagnetic Wave

With the development of the society, people become more interest in the subject that the security and the guard against the thief. It is a pop topic about how to enhance the security recently, all kinds of the securities have been invented at the follow time. Such as the infrared security, the radar security and so on, for example. But all the securities concerted above have some disadvantages, such as high distort ratio, easy to be find and deleted by the thief. It can be deleted by employing the perimeter security. The purpose of the thesis is to analyze and develop an applied perimeter security, in order to meet some civil users' need.The installation uses the coupled electromagnetic field to watch the lawless intruder. It employs the leaky coaxial cable to replace the antenna. The sensor can make the installation's setup more agility, and it can cope with the area, which have the complex boundary.The analysis on the theory mostly involved the study on the electromagnetic filed, the electromagnetic wave transmissions through the different media. Employ the field analyzed method analyzing the inner and outer change of the sensor. Through the analysis it confirmed the experimental circuit's project. Show the experimental circuit's design course. The design involves the high frequency power supply, the signal adaptor, the ADC and the signal image program. The high frequency power supply involves the oscillator, the impedance matching and the power amplifier. The adaptor involves the filter and the amplifier. The program uses the Delphi language.I have built the experimental circuit, which can watch the signal changing when someone walked through the leaky coaxial cable. The experimental installation can be setup under the ground. It has a good hiding character, because use the electromagnetic filed to inspect.