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Numerical calculation of radiation pattern of plasma channel antenna

XIA Xin-ren,YIN Cheng-you(State Key Laboratory of Pulsed Power Laser Technology,Hefei Electronic Engineering Institute,Anhui,Hefei 230037)  
The idea of plasma channel antenna(PCA) for high power microwave weapon is presented in this paper.The radiation pattern of PCA is calculated.The directivity functions of general antenna are derived.The near electromagnetic model of PCA is created based on physical circumstances.The electromagnetic fields of PCA and surrounding air in cylindrical coordinate are given.The dispersion equation of PCA is deduced by applying the boundary conditions of electromagnetic fields.The surface wave vector of PCA is achieved.The variations of radiation characteristic with plasma density,antenna length and antenna radius are emphatically discussed.The controllability of PCA’s radiation patterns is confirmed.
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