Research Of The Wide-band Electromagnetic Scattering Characteristics Of Two-dimensional Multiple Random Objects

More information of objects can be obtained from developing the wide-band radar and ultra wide-band radar. With the frequency increasing and the wavelength decreasing, the original objects become electrically large. Meanwhile, the objects are those which is multiple random distribution objects in the world. So it is important to study the wide-band electromagnetic scattering characteristics of electrically large objects and multiple random distribution objects.The theory of the method of moments(MOM) is introduced firstly in the thesis, and some basic functions and testing functions are discussed, then how to compute the radar cross sections of two-dimensional conducting objects and two-dimensional dielectric objects are also introduced. Then the wide-band electromagnetic scattering characteristics of two-dimensional conducting objects and two-dimensional dielectric objects are analyzed with the asymptotic waveform evaluation(AWE) technique. In the end, the wide-band electromagnetic scattering characteristics of the two-dimensional multiple random conducting objects and two-dimensional multiple random dielectric objects are analyzed with the asymptotic waveform evaluation technique.The systematical analysis is given in the wide-band electromagnetic scattering characteristics of two-dimensional multiple random conducting objects and two-dimensional multiple random dielectric objects for the first time in this thesis. A project is presented, which is more efficient than traditional MOM, in analyzing the wide-band electromagnetic scattering characteristics of two-dimensional multiple random conducting objects and two-dimensional multiple random dielectric objects, and while multiple random objects become large or the number of random objects become more and more, the wide-band electromagnetic scattering characteristics are very difficult to be analyzed by traditional MOM, but the presented project can solve this problem very efficiently.The investigation is very useful not only in further studying the electromagnetic scattering characteristics of multiple random conducting objects and multiple random dielectric objects over the whole frequency band, but also in improving and designing the wide-band radar, ultra wide-band radar and new wide-band radar absorbing material and so on.