Plasma fluxes and beams of charged particles draw the investigators attention to sue them for amplification and generation of electromagnetic waves. The principles of exitation, amplification and generation of microwaves in electron fluxes are well studied in such devices as TWT, EWT, magnetron types of devices etc. (1-6). In this paper the wave properties of cylindrical plasma flux injected into ionosphere infinite in longitudinal direction are analyzed and the efficiency of such plasma waveguide excited by the external generator is estimated. SInce the problems of matching are great importance the anlaysis of these problems on the basis of developed equivalent scheme is given.
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