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The antenna is an important part of the radio system , with the radio communication technology development , broaden the bandwidth of the antenna to increase the antenna function , improve performance indicators antenna workers face an important topic . This thesis through the antenna system performance in large and medium-sized parabolic antenna on retrofitting Vice feed ( array ) antenna band, provide theoretical guidance range , expand the use of such methods in engineering practice . First, starting from basic electromagnetics and antenna theory , knowledge of feed defocusing array antenna ; then commonly used in high-frequency approximation method , software and algorithms to do a brief introduction and comparison , this paper highlights for the antenna simulation the software FEKO its use of the method of moments (MoM), multilevel fast multipole ( MLFMM ) and physical optics (PO) method and other methods ; then Vice feed ( UF) in position, the different irradiation angle obtained when the antenna system performance simulation data for analysis , summarized law specifying the impact of various parameters on the performance of the antenna , and to verify the reliability of the results of this simulation by Found ; Finally, as the study content summary , a brief summary of the Vice feed ( array ) form should be used when the signal receiver for different situations , and to provide a reference for engineering applications , and at the same time , also made ??a number of areas for further research .
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