Abstract
A proposed model for a circular bunch of plasma filaments used as a virtual waveguide for microwave radiation is presented. The virtual circular guiding system is shown to support guided modes of electromagnetic radiation in the millimetre and sub-millimetre wavelength range. Transmission is due to total internal reflection of the wave on the less dense plasma cladding. The energy loss of microwave radiation propagating in such a virtual waveguide is calculated. Optimum spatial configurations of circular plasma filament waveguides are proposed. Plasma filament waveguides are shown to enhance microwave transmission relative to free space propagation of microwave radiation over limited distances.
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