Abstract
When an electromagnetic (EM) wave propagates in an atmospheric pressure plasma (APP) layer, its attenuation depends on the APP parameters such as the layer width, the electron density and its profile and collision frequency between electrons and neutrals. This paper proposes that a combined parameter—the product of the line average electron density n̄ and width d ofthe APP layer (i.e., the total number of electrons in a unit volumealong the wave propagation path) can play a more explicit anddecisive role in the wave attenuation than any of the aboveindividual parameters does. The attenuation of the EM wave via theproduct of n̄ and d with various collision frequencies between electrons and neutrals is presented.
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