The Study Of UWB Electromagnetic Field Propagating And Decaying Properties

There have been many systemic theories on propagating properties of UWB electromagnetic field in the air, but nothing about its scattering properties as well as decaying properties in medium. This work was one part of research on UWB electromagnetic exploration methods in the field of urban disaster life rescue, No. 40374027, National Natural Science Fund of China. For solving the problem of living security and filling vacancy in the field in our country, this paper were mainly about the simulation and study about the propagating properties of UWB electromagnetic field, which includes: analyzing properties of propagating characteristics, decaying characteristics and scattering properties of UWB electromagnetic field. Through simulation and compute, we analyzed the properties of propagation, decaying and scattering of UWB electromagnetic field in different medium, completed the analysis of time-domain wave field, decaying field and scattering field of UWB electromagnetic field. At last, we compared UWB with the wide band and narrow band electromagnetic wave as the exciting pulse. Specially, all the results were analytical solution of mathematical-physical equation, not the numerical solution.Study around the propagating properties of UWB electromagnetic field involved in this paper, the problems were discussed in different extent using simulation and theories, including: radiation theory of UWB, energy density, the relationship of radiation aperture, the decaying properties and the scattering of ideal target in different medium.1. The definition of UWB electromagnetic pulse signal was introduced and analysis to this definition was carded on. Then a standard driving pulse of UWB electromagnetic wave was assigned, which is used to study the relations of electromagnetic field intensity with the aperture size and the driving pulse on the axis of UWB TEM aperture antennas.2. Radiation field and energy flaw of even current distribution was discussed using potential function solution of Maxwell equation.3. The decaying properties of UWB electromagnetic wave in the medium were studied, and the definition about skin depth of UWB electromagnetic wave was defined. Then the skin depth of wide band, narrow band and UWB electromagnetic wave which have the same basic frequency were compared. 4. Based on the requests of application, the scattering properties of UWB electromagnetic wave in the medium and be put on the ideal conductor in the wall survey were analyzed.5. The results in this paper were analytical, not numerical. Matlab was used to simulate and the results were compared with numerical simulation. The simulation results established the accuracy and reliability of this paper, so the project is feasibility.