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Impedance of cylindrical dipole during hypersonic flight

This paper focuses on the influences of the plasma sheath around a hypersonic vehicle on the impedance of antenna. The practical plasma sheath of an RAM-C vehicle when flying at 71km at the speed of 25.91 Ma is calculated by fluid analysis method. And the effects of the plasma sheath on the impedance of a dipole antenna which is working at 4GHz are then researched by electromagnetic analysis method in HFSS. The results show that when a dipole is surrounded by the plasma sheath in this situation, the real part of impedance can increase a lot and the resonant frequency can shift to higher band by 12 percent. This conclusion may provide valuable references for the antenna design on hypersonic vehicle.