Missile Radar Compartment Plasma Stealth Principle Study

The mastery of radio wave is a key factor of winning mastery of the sky and thalassocracy in the modern hi-tech war. All kinds of antennas are applied in the confrontation of radio bands. The current radar antennae are made of metal. The stealth designation of an entire campaign system is quite difficult because RCS is much too large.The stealth theory of plasma in missal radar-dome is researched with theoretical computation and experiment analysis in the paper. The computation of absorb with magnetized plasma is conducted with the method of equivalent input impedance. The relation between magnetic field and absorb of plasma is discussed. Based on MPT, the experimental research on the interaction between plasma and radio wave is made with the plan of permittivity testing of transmission line method and space-wave method. A primary experiment of the stealth model of plasma in missal radar-dome is made in the vacuum environment with the scheme of space-wave-method.The conclusion is that the reflectance coefficient of radio wave energy is less than 0.1 by plasma in the front of metal flat;the relation among the factors of plasma (electron numerical density and collision frequency), magnetic intensity and incidence wave frequency must be coordinated in order that magnetized plasma can produce the strongly absorb of radio wave.The experimental results show that the sound method of transmission line and method of space-wave can successfully measure the absorption of incidence radio wave by plasma. The plasma produced by power of radio wave around 60W in the vacuum environment can effectively produce reflect loss of 20dB above of radio wave which frequency is around 7GHz. The plasma stuffed in the radar-dome can absorb incident radio wave effectually, incidence radio wave can attenuate less than 1% of an initial value maximally after the absorb and refraction of plasma. When the density value of electron numerical density in a radar-dome reaches a fixed value, the absorb effect of incidence radio wave by plasma is not added with the increase of electron numerical density since the limit of margin condition. The stealth effect is not strengthened obviously with the unrestrained decrease of intensity of pressure of the experimental environment.