We study numerically the two-dimensional problem of excitation of a hollow round cylinder, which is made of a nonmagnetic material with μ = 1 and the negative dielectric permittivity ε < 0, by a filamentary source. It is found that when the relative dielectric permittivity is close to −1, high-Q resonances exist in hollow cylinders having electrically small diameters. We show that when the source of a cylindrical wave is located within the cavity, undirected radiation is converted at the resonance frequency into multipole radiation with a great number of identical lobes in the radiation pattern. The patterns of the near and far fields are calculated. The influence of the loss on the resonance properties is studied.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 56, No. 5, pp. 330–336, May 2013.
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Anyutin, A.P., Korshunov, I.P. & Shatrov, A.D. Resonant Conversion of the Point-Source Field to Multipole Radiation Using Ring Layer of the Overcritical Plasma. Radiophys Quantum El 56, 298–303 (2013). https://doi.org/10.1007/s11141-013-9434-0
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DOI: https://doi.org/10.1007/s11141-013-9434-0