| Nowadays,the form of warfare has developed into the war with the emphasis on electronic and information,so the airborne platform has an urgent need for an antenna with excellent radiation and scattering performance.Therefore,an ultra wideband conformal antenna is designed in this thesis and its electromagnetic scattering is studied.The conformal antenna uses resistors to achieve high gain and low standing wave ratio in the ultra-wideband range.At the same time,in order to further improve the scattering performance,two kinds of RCS reduction methods are studied and applied to the designed conformal antenna.Firstly,in order to solve the modeling difficulties of wing skin in practical engineering,a method of surface fitting and energy conformal modeling optimization is proposed in this thesis.The type and shape of conformal antenna are determined by simulation analysis.By studying two kinds of resistive loading,a 5*12 scale conformal antenna array is designed.The results show that the conformal antenna has ultrawideband characteristics,covering the frequency range of 4GHz to 10 GHz,the gain is stable above 14 d Bi and the active standing wave ratio is lower than 2.6.This proves that the conformal antenna designed by us has good performance.Secondly,the electromagnetic scattering of the conformal antenna is studied in this thesis.A low scattering carrier is designed which can reflect the actual installation attitude.Based on the carrier,the RCS values of the antenna at different frequencies are evaluated by simulation analysis.Then,two kinds of RCS reduction techniques are studied and applied to conformal antennas to evaluate their effects on antenna performance. |
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