Research On Missile Borne Wideband Antenna

Antennas are the conversion interface of missile wireless communication,radar,guidance and other systems.The performance of the antenna directly determines the effectiveness of the missile.Therefore,the research on the missile borne antenna is of great significance.In this paper,broadband missile borne antennas are designed with the research of the pre research project.The main work and results of this article are as follows:First of all,the background significance of this paper is expounded.The current research status of theoretical analysis and design of missile borne antenna is introduced,and the design theory behind it is explained.Then,a omnidirectional oblique polarization antenna and a new omnidirectional circular polarized antenna are proposed in the light of the pre research project.The scheme of omnidirectional oblique polarized antenna is a bi-conical antenna outlay a oblique polarizer.The bi-conical antenna can generate vertically polarized electromagnetic wave,and the vertically polarized electromagnetic wave is twisted to 45 degree oblique polarized wave through the oblique polarizer.The simulation results show that the scheme can obtain better oblique polarization wave in a wider frequency band.In order to improve the performance of the antenna in the missile body,on the basis of the scheme,the biconical antenna is improved to a single cone antenna.and The performance of the polarizers with different shapes,the electrical contact of the polarizer with the floor and the influence of the parameters on the performance of the antenna are discussed.The combined simulation of the two antennas and projectiles is carried out,and the results are compared.It is found that the improved antenna has better performance on the projectile.Based on the same idea,a new scheme of wide-band omnidirectional circular polarized antenna is proposed.The omni-directional circularly polarized antenna is composed of a bi-conical antenna and a hollow cylindrical polarizer.The circular polarized wave radiated by the double cone antenna is torsional to circular polarization by circular polarizer.First analyzes the influence of geometric parameters on single circular polarization unit,then analyzes the co simulation of antenna and circular polarization,the simulation results show that the antenna with circular polarization axial ratio is less than or equal to 4dB bandwidth of 2.25 octave above the maximum gain,5dBi,out of roundness is less than 1dB,and the antenna is tested.Finally,based on the design theory of the conical logarithmic spiral antenna,two conical logarithmic spiral antennas and their feed balun are designed.An improved spiral line balun is designed for low frequency antenna with insufficient cavity height.Then the influence of antenna position and deflection angle on the gain of the pattern is analyzed.For the high frequency antenna,the influence of the base radius of the antenna and the distance from the bottom of the cavity on the low elevation angle is mainly discussed.The final simulation results basically meet the requirements of the index.