Low Sidelobe Phased Array Antennas

Along with the milital demand and the requirement of probinging and tracking outer-space objects, the development of radar have reached a new phase梡hased array radar, especially low sidelobe phased array radar has become development mainstream. Phased array antennas have some special capabilities, such as capability of fast scanning and changing the pattern shape and so on. At the same time the realization of low sidelobe phased array become very difficult. The analyzing of phased array antenna low sidelobe has important significance.There are many factors that can influence the phased array antenna sidelobe level. In this paper the author select three kinds of factor of them to analyze. The three factor is the mutual coupling between antenna units, phase quantization sidelobe and array tolerance.On analyzing the effect of mutual coupling, this paper uses method of moment. Subsection sinusoidal expansion function and testing function are used to calculate array current distribution. It overcomes the shortcoming of assuming current distribution This thesis also discusses three kinds of exciting source. On analyzing the effect of phase quantization sidelobe, this paper uses simulate method to calculate the effect of different present phase methods. The method of simulating is used to calculate the effect of antenna phased array random tolerance. Because it is difficult to calculate the antenna unit pattern using MoM. this paper uses Ansoft-Hfss to simulate unit pattern. Using unit pattern, this thesis analyzes a sixteen units, print dipole real phased array, including the effect of mutual coupling, quantazation sidelobe and array random tolerance, and compare the theory result and measured result...