The Research Of Double Scourge Antenna's Radialization On Warship Using The FDTD Method

This thesis calculates and simulates the double scourge antenna's radialization mainly using the theory of FDTD , provides a part of data to make certain the warship EM environment, and finally analyzes a few essentials to the EMC design to communication systems on warship in brief.Theoretically, the main work is to investigate the combination of FDTD method with Z transforms. First of all, it is difficulty to simulate the propagation of EM wave in a dispersive medium using the FDTD method because of the complication of the dielectric function in it. So it is indispensable to modify the Maxwell's equations and use Z transforms to make the most of FDTD equations more independent of the dielectric function and more convenient for the generalization of programs . Secondly, there is an betterment on implementing the 2-D and 3-D PML absorbing boundary condition ,which is one of the inportant topics in FDTD simulation, using the virtual material and Z trandforms.In the application, this thesis adopts the method of separating the material characteristic and the FDTD equations ,and sets up the source district and the antenna district respectively, then caculats the EM wave of the double scourge antenna using the coaxial cable source excition . Finally, this thesis analyzes the antenna radiates and its S parameter with the different warship superstructure size or antenna positions,giving out many charts,which are very useful to make sure the EM environment on warship and optimize the antenna arrangement, which is also useful to design this kind of antenna.