Numerical Analysis Of Near Field Of Wire Antennas

The thesis focus on the study of the wire antenna's near-field, especially the method of solving the near-field of wire antenna and its practical significance. Firstly, it introcduced the parameters which are usually used to describe the wire antenna and the current of the study on wire antenna's near-field, and proposed an efficient method which measures and describes the near-field of wire antenna. Then the Hallen integral equation of loaded wire antenna was deduced and the generalized Hallen integral-equation of curvilinear antenna was introduced. Secondly,,MoM is chosen to solve the current distribution of the symmetry dipole and thin helical multiturn loop antenna; and the near-field couple of the two kinds of antenna, can be solved by the vector potential formula; in the end, the near-field couple was computed by the above introduced measurement methods. During above procedure, the exact form of the kernel function was used to ensure the accuracy of result; besides, the Bessel functions was employed to simplify the sophisticated kernel function. Similarly, the necessarry parameters which are used to complete the generalized Hallen equation of helical antenna were deduced, and the more sophiscated kernel function were properly transformated. Thirdly, the MoM code were practised on VC and Mathematica, and the graph which illustrates that the couple varies with the distance between the antennas are displayed . Accordingly, necessary related discussion and analysis are given. At last, the sum-up and deficeincy of my work are discussed.