Research Of Signal Mode Radiation Leaky Coaxial Cable Used For Ultra Wide-Band Communication

Leaky coaxial cable is more suited than common antennas when it is used in the blind zones such as mines, subway, tunnel and buildings, since it has shown its tremendous advantages over common antennas, such as uniform signal, low coupling loss and so on. With the rapid development of mobile communication, we need to supply signal coverage for all kinds of communication systems in blind zones, and this creates a problem for which, we have to find the solution immediately. So we need a new type of leaky coaxial cable whose operating frequency band should be wide enough for the duplex continuous communication in the blind zones.Starting from the operating principle of leaky coaxial cable (LCX in short hereinafter), the paper introduces LCX's physical structure and parameters and discusses the factors that would influences its parameters. After that, it discusses the radiation principle of LCX based on its structure, analyses its radiation models and explains what is single model radiation and its advantages. Based on that, the paper discusses how to expand the single mode radiation band of LCX and studies a method of expanding the bandwidth of the LCX with inclined slots, which would supply a practical approach of applying LCX in ultra wide-band communication. The conclusions we present in this paper is significant for the design and use of LCX applied to ultra wide-band communication. Finally, the paper discusses the LCX's radiating direction, radial radiation distance and resonant points of the working frequency band, which should be considerated carefully when we design the LCX used for ultra wide-band communication.